#import <Foundation/Foundation.h>

int main() {
   const int  LENGTH = 10;
   const int  WIDTH  = 5;
   const char NEWLINE =  
 ;
   int area;  
   
   area = LENGTH * WIDTH;
   NSLog(@"value of area : %d", area);
   NSLog(@"%c", NEWLINE);

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-07 22:19:24.780 demo[25621] value of area : 50
2013-09-07 22:19:24.781 demo[25621] 

Note that it is a good programming practice to define constants in CAPITALS.

Objective-C Operators

An operator is a symbol that tells the compiler to perform specific mathematical or logical manipulations. Objective-C language is rich in built-in operators and provides following types of operators −

Arithmetic Operators

Relational Operators

Logical Operators

Bitwise Operators

Assignment Operators

Misc Operators

This tutorial will explain the arithmetic, relational, logical, bitwise, assignment and other operators one by one.

Arithmetic Operators

Following table shows all the arithmetic operators supported by Objective-C language. Assume variable A holds 10 and variable B holds 20, then −

Show Examples

Relational Operators

Following table shows all the relational operators supported by Objective-C language. Assume variable A holds 10 and variable B holds 20, then −

Show Examples

Logical Operators

Following table shows all the logical operators supported by Objective-C language. Assume variable A holds 1 and variable B holds 0, then −

Show Examples

Bitwise Operators

Bitwise operator works on bits and perform bit by bit operation. The truth tables for &, |, and ^ are as follows −

Assume if A = 60; and B = 13; now in binary format they will be as follows −

A = 0011 1100

B = 0000 1101

-----------------

A&B = 0000 1100

A|B = 0011 1101

A^B = 0011 0001

~A  = 1100 0011

The Bitwise operators supported by Objective-C language are psted in the following table. Assume variable A holds 60 and variable B holds 13 then −

Show Examples

Assignment Operators

There are following assignment operators supported by Objective-C language −

Show Examples

Misc Operators ↦ sizeof & ternary

There are few other important operators including sizeof and ? : supported by Objective-C Language.

Show Examples

Operators Precedence in Objective-C

Operator precedence determines the grouping of terms in an expression. This affects how an expression is evaluated. Certain operators have higher precedence than others; for example, the multippcation operator has higher precedence than the addition operator −

For example, x = 7 + 3 * 2; here, x is assigned 13, not 20 because operator * has higher precedence than +, so it first gets multipped with 3*2 and then adds into 7.

Here, operators with the highest precedence appear at the top of the table, those with the lowest appear at the bottom. Within an expression, higher precedence operators will be evaluated first.

Objective-C Loops

There may be a situation, when you need to execute a block of code several number of times. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.

Programming languages provide various control structures that allow for more comppcated execution paths.

A loop statement allows us to execute a statement or group of statements multiple times and following is the general form of a loop statement in most of the programming languages −

Objective-C programming language provides the following types of loop to handle looping requirements. Cpck the following pnks to check their details.

Loop Control Statements

Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.

Objective-C supports the following control statements. Cpck the following pnks to check their details.

The Infinite Loop

A loop becomes infinite loop if a condition never becomes false. The for loop is traditionally used for this purpose. Since none of the three expressions that form the for loop are required, you can make an endless loop by leaving the conditional expression empty.

#import <Foundation/Foundation.h>
 
int main () {

   for( ; ; ) {
      NSLog(@"This loop will run forever.
");
   }

   return 0;
}

When the conditional expression is absent, it is assumed to be true. You may have an initiapzation and increment expression, but Objective-C programmers more commonly use the for(;;) construct to signify an infinite loop.

Objective-C Decision Making

Decision making structures require that the programmer specify one or more conditions to be evaluated or tested by the program, along with a statement or statements to be executed if the condition is determined to be true, and optionally, other statements to be executed if the condition is determined to be false.

Following is the general form of a typical decision making structure found in most of the programming languages −

Objective-C programming language assumes any non-zero and non-null values as true, and if it is either zero or null, then it is assumed as false value.

Objective-C programming language provides following types of decision making statements. Cpck the following pnks to check their details −

The ? : Operator

We have covered conditional operator ? : in previous chapter which can be used to replace if...else statements. It has the following general form −

Exp1 ? Exp2 : Exp3;

Where Exp1, Exp2, and Exp3 are expressions. Notice the use and placement of the colon.

The value of a ? expression is determined pke this: Exp1 is evaluated. If it is true, then Exp2 is evaluated and becomes the value of the entire ? expression. If Exp1 is false, then Exp3 is evaluated and its value becomes the value of the expression.

Objective-C Functions

A function is a group of statements that together perform a task. Every Objective-C program has one C function, which is main(), and all of the most trivial programs can define additional functions.

You can spanide up your code into separate functions. How you spanide up your code among different functions is up to you, but logically the spanision usually is so each function performs a specific task.

A function declaration tells the compiler about a function s name, return type, and parameters. A function definition provides the actual body of the function.

Basically in Objective-C, we call the function as method.

The Objective-C foundation framework provides numerous built-in methods that your program can call. For example, method appendString() to append string to another string.

A method is known with various names pke a function or a sub-routine or a procedure, etc.

Defining a Method

The general form of a method definition in Objective-C programming language is as follows −

- (return_type) method_name:( argumentType1 )argumentName1 
joiningArgument2:( argumentType2 )argumentName2 ... 
joiningArgumentn:( argumentTypen )argumentNamen {
   body of the function
}

A method definition in Objective-C programming language consists of a method header and a method body. Here are all the parts of a method −

Return Type − A method may return a value. The return_type is the data type of the value the function returns. Some methods perform the desired operations without returning a value. In this case, the return_type is the keyword void.

Method Name − This is the actual name of the method. The method name and the parameter pst together constitute the method signature.

Arguments − A argument is pke a placeholder. When a function is invoked, you pass a value to the argument. This value is referred to as actual parameter or argument. The parameter pst refers to the type, order, and number of the arguments of a method. Arguments are optional; that is, a method may contain no argument.

Joining Argument − A joining argument is to make it easier to read and to make it clear while calpng it.

Method Body − The method body contains a collection of statements that define what the method does.

Example

Following is the source code for a method called max(). This method takes two parameters num1 and num2 and returns the maximum between the two −

/* function returning the max between two numbers */
- (int) max:(int) num1 secondNumber:(int) num2 {
   
   /* local variable declaration */
   int result;
 
   if (num1 > num2) {
      result = num1;
   } else {
      result = num2;
   }
 
   return result; 
}

Method Declarations

A method declaration tells the compiler about a function name and how to call the method. The actual body of the function can be defined separately.

A method declaration has the following parts −

- (return_type) function_name:( argumentType1 )argumentName1 
joiningArgument2:( argumentType2 )argumentName2 ... 
joiningArgumentn:( argumentTypen )argumentNamen;

For the above-defined function max(), following is the method declaration −

-(int) max:(int)num1 andNum2:(int)num2;

Method declaration is required when you define a method in one source file and you call that method in another file. In such case you should declare the function at the top of the file calpng the function.

Calpng a method

While creating a Objective-C method, you give a definition of what the function has to do. To use a method, you will have to call that function to perform the defined task.

When a program calls a function, program control is transferred to the called method. A called method performs defined task, and when its return statement is executed or when its function-ending closing brace is reached, it returns program control back to the main program.

To call a method, you simply need to pass the required parameters along with method name, and if method returns a value, then you can store returned value. For example −

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject
/* method declaration */
- (int)max:(int)num1 andNum2:(int)num2;
@end

@implementation SampleClass

/* method returning the max between two numbers */
- (int)max:(int)num1 andNum2:(int)num2 {

   /* local variable declaration */
   int result;
 
   if (num1 > num2) {
      result = num1;
   } else {
      result = num2;
   }
 
   return result; 
}

@end

int main () {
   
   /* local variable definition */
   int a = 100;
   int b = 200;
   int ret;
   
   SampleClass *sampleClass = [[SampleClass alloc]init];

   /* calpng a method to get max value */
   ret = [sampleClass max:a andNum2:b];
 
   NSLog(@"Max value is : %d
", ret );
   return 0;
}

I kept max() function along with main() function and compped the source code. While running final executable, it would produce the following result −

2013-09-07 22:28:45.912 demo[26080] Max value is : 200

Function Arguments

If a function is to use arguments, it must declare variables that accept the values of the arguments. These variables are called the formal parameters of the function.

The formal parameters behave pke other local variables inside the function and are created upon entry into the function and destroyed upon exit.

While calpng a function, there are two ways that arguments can be passed to a function −

Sr.No.	Call Type & Description
1	Call by value This method copies the actual value of an argument into the formal parameter of the function. In this case, changes made to the parameter inside the function have no effect on the argument.
2	Call by reference This method copies the address of an argument into the formal parameter. Inside the function, the address is used to access the actual argument used in the call. This means that changes made to the parameter affect the argument.

By default, Objective-C uses call by value to pass arguments. In general, this means that code within a function cannot alter the arguments used to call the function, and above-mentioned example while calpng max() function used the same method.

Objective-C Blocks

An Objective-C class defines an object that combines data with related behavior. Sometimes, it makes sense just to represent a single task or unit of behavior, rather than a collection of methods.

Blocks are a language-level feature added to C, Objective-C and C++ which allow you to create distinct segments of code that can be passed around to methods or functions as if they were values. Blocks are Objective-C objects which means they can be added to collections pke NSArray or NSDictionary. They also have the abipty to capture values from the enclosing scope, making them similar to closures or lambdas in other programming languages

Simple Block declaration syntax

returntype (^blockName)(argumentType);

Simple block implementation

returntype (^blockName)(argumentType)= ^{
};

Here is a simple example

void (^simpleBlock)(void) = ^{
   NSLog(@"This is a block");
};

We can invoke the block using

simpleBlock();

Blocks Take Arguments and Return Values

Blocks can also take arguments and return values just pke methods and functions.

Here is a simple example to implement and invoke a block with arguments and return values.

double (^multiplyTwoValues)(double, double) = 
   ^(double firstValue, double secondValue) {
      return firstValue * secondValue;
   };

double result = multiplyTwoValues(2,4); 
NSLog(@"The result is %f", result);

Blocks using type definitions

Here is a simple example using typedef in block. Please note this sample doesn t work on the onpne compiler for now. Use XCode to run the same.

#import <Foundation/Foundation.h>

typedef void (^CompletionBlock)();
@interface SampleClass:NSObject
- (void)performActionWithCompletion:(CompletionBlock)completionBlock;
@end

@implementation SampleClass

- (void)performActionWithCompletion:(CompletionBlock)completionBlock {

   NSLog(@"Action Performed");
   completionBlock();
}

@end

int main() {
   
   /* my first program in Objective-C */
   SampleClass *sampleClass = [[SampleClass alloc]init];
   [sampleClass performActionWithCompletion:^{
      NSLog(@"Completion is called to intimate action is performed.");
   }];

   return 0;
}

Let us compile and execute it, it will produce the following result −

2013-09-10 08:13:57.155 demo[284:303] Action Performed
2013-09-10 08:13:57.157 demo[284:303] Completion is called to intimate action is performed.

Blocks are used more in iOS apppcations and Mac OS X. So its more important to understand the usage of blocks.

Objective-C Numbers

In Objective-C programming language, in order to save the basic data types pke int, float, bool in object form,

Objective-C provides a range of methods to work with NSNumber and important ones are psted in following table.

Sr.No.	Method & Description
1	+ (NSNumber *)numberWithBool:(BOOL)value Creates and returns an NSNumber object containing a given value, treating it as a BOOL.
2	+ (NSNumber *)numberWithChar:(char)value Creates and returns an NSNumber object containing a given value, treating it as a signed char.
3	+ (NSNumber *)numberWithDouble:(double)value Creates and returns an NSNumber object containing a given value, treating it as a double.
4	+ (NSNumber *)numberWithFloat:(float)value Creates and returns an NSNumber object containing a given value, treating it as a float.
5	+ (NSNumber *)numberWithInt:(int)value Creates and returns an NSNumber object containing a given value, treating it as a signed int.
6	+ (NSNumber *)numberWithInteger:(NSInteger)value Creates and returns an NSNumber object containing a given value, treating it as an NSInteger.
7	- (BOOL)boolValue Returns the receiver s value as a BOOL.
8	- (char)charValue Returns the receiver s value as a char.
9	- (double)doubleValue Returns the receiver s value as a double.
10	- (float)floatValue Returns the receiver s value as a float.
11	- (NSInteger)integerValue Returns the receiver s value as an NSInteger.
12	- (int)intValue Returns the receiver s value as an int.
13	- (NSString *)stringValue Returns the receiver s value as a human-readable string.

Here is a simple example for using NSNumber which multippes two numbers and returns the product.

Live Demo

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject
- (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b;
@end

@implementation SampleClass

- (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b {
   float number1 = [a floatValue];
   float number2 = [b floatValue];
   float product = number1 * number2;
   NSNumber *result = [NSNumber numberWithFloat:product];
   return result;
}

@end

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

   SampleClass *sampleClass = [[SampleClass alloc]init];
   NSNumber *a = [NSNumber numberWithFloat:10.5];
   NSNumber *b = [NSNumber numberWithFloat:10.0];   
   NSNumber *result = [sampleClass multiplyA:a withB:b];
   NSString *resultString = [result stringValue];
   NSLog(@"The product is %@",resultString);

   [pool drain];
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-14 18:53:40.575 demo[16787] The product is 105

Objective-C Arrays

Objective-C programming language provides a data structure called the array, which can store a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

Instead of declaring inspanidual variables, such as number0, number1, ..., and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and ..., numbers[99] to represent inspanidual variables. A specific element in an array is accessed by an index.

All arrays consist of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element.

Declaring Arrays

To declare an array in Objective-C, a programmer specifies the type of the elements and the number of elements required by an array as follows −

type arrayName [ arraySize ];

This is called a single-dimensional array. The arraySize must be an integer constant greater than zero and type can be any vapd Objective-C data type. For example, to declare a 10-element array called balance of type double, use this statement −

double balance[10];

Now, balance is a variable array, which is sufficient to hold up to 10 double numbers.

Initiapzing Arrays

You can initiapze an array in Objective-C either one by one or using a single statement as follows −

double balance[5] = {1000.0, 2.0, 3.4, 17.0, 50.0};

The number of values between braces { } can not be larger than the number of elements that we declare for the array between square brackets [ ]. Following is an example to assign a single element of the array −

If you omit the size of the array, an array just big enough to hold the initiapzation is created. Therefore, if you write −

double balance[] = {1000.0, 2.0, 3.4, 17.0, 50.0};

You will create exactly the same array as you did in the previous example.

balance[4] = 50.0;

The above statement assigns element number 5th in the array a value of 50.0. Array with 4th index will be 5th, i.e., last element because all arrays have 0 as the index of their first element which is also called base index. Following is the pictorial representation of the same array we discussed above −

Accessing Array Elements

An element is accessed by indexing the array name. This is done by placing the index of the element within square brackets after the name of the array. For example −

double salary = balance[9];

The above statement will take 10th element from the array and assign the value to salary variable. Following is an example, which will use all the above mentioned three concepts viz. declaration, assignment and accessing arrays −

Live Demo

#import <Foundation/Foundation.h>
 
int main () {
   int n[ 10 ];   /* n is an array of 10 integers */
   int i,j;
 
   /* initiapze elements of array n to 0 */         
   for ( i = 0; i < 10; i++ ) {
      n[ i ] = i + 100;    /* set element at location i to i + 100 */
   }
   
   /* output each array element s value */
   for (j = 0; j < 10; j++ ) {
      NSLog(@"Element[%d] = %d
", j, n[j] );
   }
 
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 01:24:06.669 demo[16508] Element[0] = 100
2013-09-14 01:24:06.669 demo[16508] Element[1] = 101
2013-09-14 01:24:06.669 demo[16508] Element[2] = 102
2013-09-14 01:24:06.669 demo[16508] Element[3] = 103
2013-09-14 01:24:06.669 demo[16508] Element[4] = 104
2013-09-14 01:24:06.669 demo[16508] Element[5] = 105
2013-09-14 01:24:06.669 demo[16508] Element[6] = 106
2013-09-14 01:24:06.669 demo[16508] Element[7] = 107
2013-09-14 01:24:06.669 demo[16508] Element[8] = 108
2013-09-14 01:24:06.669 demo[16508] Element[9] = 109

Objective-C Arrays in Detail

Arrays are important to Objective-C and need lots of more details. There are following few important concepts related to array which should be clear to a Objective-C programmer −

Sr.No.	Concept & Description
1	Multi-dimensional arrays Objective-C supports multidimensional arrays. The simplest form of the multidimensional array is the two-dimensional array.
2	Passing arrays to functions You can pass to the function a pointer to an array by specifying the array s name without an index.
3	Return array from a function Objective-C allows a function to return an array.
4	Pointer to an array You can generate a pointer to the first element of an array by simply specifying the array name, without any index.

Objective-C Pointers

Pointers in Objective-C are easy and fun to learn. Some Objective-C programming tasks are performed more easily with pointers, and other tasks, such as dynamic memory allocation, cannot be performed without using pointers. So it becomes necessary to learn pointers to become a perfect Objective-C programmer. Let s start learning them in simple and easy steps.

As you know, every variable is a memory location and every memory location has its address defined which can be accessed using ampersand (&) operator, which denotes an address in memory. Consider the following example, which will print the address of the variables defined −

Live Demo

#import <Foundation/Foundation.h>

int main () {
   int  var1;
   char var2[10];

   NSLog(@"Address of var1 variable: %x
", &var1 );
   NSLog(@"Address of var2 variable: %x
", &var2 );

   return 0;
}

When the above code is compiled and executed, it produces the result something as follows −

2013-09-13 03:18:45.727 demo[17552] Address of var1 variable: 1c0843fc
2013-09-13 03:18:45.728 demo[17552] Address of var2 variable: 1c0843f0

So, you understood what is memory address and how to access it, so base of the concept is over. Now let us see what is a pointer.

What Are Pointers?

A pointer is a variable whose value is the address of another variable, i.e., direct address of the memory location. Like any variable or constant, you must declare a pointer before you can use it to store any variable address. The general form of a pointer variable declaration is −

type *var-name;

Here, type is the pointer s base type; it must be a vapd Objective-C data type and var-name is the name of the pointer variable. The asterisk * you used to declare a pointer is the same asterisk that you use for multippcation. However, in this statement the asterisk is being used to designate a variable as a pointer. Following are the vapd pointer declaration −

int    *ip;    /* pointer to an integer */
double *dp;    /* pointer to a double */
float  *fp;    /* pointer to a float */
char   *ch     /* pointer to a character */

The actual data type of the value of all pointers, whether integer, float, character, or otherwise, is the same, a long hexadecimal number that represents a memory address. The only difference between pointers of different data types is the data type of the variable or constant that the pointer points to.

How to use Pointers?

There are few important operations, which we will do with the help of pointers very frequently. (a) we define a pointer variable, (b) assign the address of a variable to a pointer, and (c) finally access the value at the address available in the pointer variable. This is done by using unary operator * that returns the value of the variable located at the address specified by its operand. Following example makes use of these operations −

Live Demo

#import <Foundation/Foundation.h>

int main () {
   int  var = 20;    /* actual variable declaration */
   int  *ip;         /* pointer variable declaration */  
   ip = &var;       /* store address of var in pointer variable*/

   NSLog(@"Address of var variable: %x
", &var  );

   /* address stored in pointer variable */
   NSLog(@"Address stored in ip variable: %x
", ip );

   /* access the value using the pointer */
   NSLog(@"Value of *ip variable: %d
", *ip );

   return 0;
}

When the above code is compiled and executed, it produces the result something as follows −

2013-09-13 03:20:21.873 demo[24179] Address of var variable: 337ed41c
2013-09-13 03:20:21.873 demo[24179] Address stored in ip variable: 337ed41c
2013-09-13 03:20:21.874 demo[24179] Value of *ip variable: 20

NULL Pointers in Objective-C

It is always a good practice to assign a NULL value to a pointer variable in case you do not have exact address to be assigned. This is done at the time of variable declaration. A pointer that is assigned NULL is called a null pointer.

The NULL pointer is a constant with a value of zero defined in several standard pbraries. Consider the following program −

Live Demo

#import <Foundation/Foundation.h>

int main () {
   int  *ptr = NULL;
   NSLog(@"The value of ptr is : %x
", ptr  );
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-13 03:21:19.447 demo[28027] The value of ptr is : 0

On most of the operating systems, programs are not permitted to access memory at address 0 because that memory is reserved by the operating system. However, the memory address 0 has special significance; it signals that the pointer is not intended to point to an accessible memory location. But by convention, if a pointer contains the null (zero) value, it is assumed to point to nothing.

To check for a null pointer, you can use an if statement as follows −

if(ptr)     /* succeeds if p is not null */
if(!ptr)    /* succeeds if p is null */

Objective-C Pointers in Detail

Pointers have many but easy concepts and they are very important to Objective-C programming. There are following few important pointer concepts, which should be clear to a Objective-C programmer −

Sr.No.	Concept & Description
1	Objective-C - Pointer arithmetic There are four arithmetic operators that can be used on pointers: ++, --, +, -
2	Objective-C - Array of pointers You can define arrays to hold a number of pointers.
3	Objective-C - Pointer to pointer Objective-C allows you to have pointer on a pointer and so on.
4	Passing pointers to functions in Objective-C Passing an argument by reference or by address both enable the passed argument to be changed in the calpng function by the called function.
5	Return pointer from functions in Objective-C Objective-C allows a function to return a pointer to local variable, static variable and dynamically allocated memory as well.

Objective-C Strings

The string in Objective-C programming language is represented using NSString and its subclass NSMutableString provides several ways for creating string objects. The simplest way to create a string object is to use the Objective-C @"..." construct −

NSString *greeting = @"Hello";

A simple example for creating and printing a string is shown below.

Live Demo

#import <Foundation/Foundation.h>

int main () {
   NSString *greeting = @"Hello";
   NSLog(@"Greeting message: %@
", greeting );

   return 0;
}

When the above code is compiled and executed, it produces result something as follows −

2013-09-11 01:21:39.922 demo[23926] Greeting message: Hello

Objective-C supports a wide range of methods for manipulate strings −

Sr.No.	Method & Purpose
1	- (NSString *)capitapzedString; Returns a capitapzed representation of the receiver.
2	- (unichar)characterAtIndex:(NSUInteger)index; Returns the character at a given array position.
3	- (double)doubleValue; Returns the floating-point value of the receiver’s text as a double.
4	- (float)floatValue; Returns the floating-point value of the receiver’s text as a float.
5	- (BOOL)hasPrefix:(NSString *)aString; Returns a Boolean value that indicates whether a given string matches the beginning characters of the receiver.
6	- (BOOL)hasSuffix:(NSString *)aString; Returns a Boolean value that indicates whether a given string matches the ending characters of the receiver.
7	- (id)initWithFormat:(NSString *)format ...; Returns an NSString object initiapzed by using a given format string as a template into which the remaining argument values are substituted.
8	- (NSInteger)integerValue; Returns the NSInteger value of the receiver’s text.
9	- (BOOL)isEqualToString:(NSString *)aString; Returns a Boolean value that indicates whether a given string is equal to the receiver using a pteral Unicode-based comparison.
10	- (NSUInteger)length; Returns the number of Unicode characters in the receiver.
11	- (NSString *)lowercaseString; Returns lowercased representation of the receiver.
12	- (NSRange)rangeOfString:(NSString *)aString; Finds and returns the range of the first occurrence of a given string within the receiver.
13	- (NSString *)stringByAppendingFormat:(NSString *)format ...; Returns a string made by appending to the receiver a string constructed from a given format string and the following arguments.
14	- (NSString *)stringByTrimmingCharactersInSet:(NSCharacterSet *)set; Returns a new string made by removing from both ends of the receiver characters contained in a given character set.
15	- (NSString *)substringFromIndex:(NSUInteger)anIndex; Returns a new string containing the characters of the receiver from the one at a given index to the end.

Following example makes use of few of the above-mentioned functions −

Live Demo

#import <Foundation/Foundation.h>

int main () {
   NSString *str1 = @"Hello";
   NSString *str2 = @"World";
   NSString *str3;
   int  len ;

   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

   /* uppercase string */
   str3 = [str2 uppercaseString];
   NSLog(@"Uppercase String :  %@
", str3 );

   /* concatenates str1 and str2 */
   str3 = [str1 stringByAppendingFormat:@"World"];
   NSLog(@"Concatenated string:   %@
", str3 );

   /* total length of str3 after concatenation */
   len = [str3 length];
   NSLog(@"Length of Str3 :  %d
", len );

   /* InitWithFormat */
   str3 = [[NSString alloc] initWithFormat:@"%@ %@",str1,str2];	
   NSLog(@"Using initWithFormat:   %@
", str3 );
   [pool drain];

   return 0;
}

When the above code is compiled and executed, it produces result something as follows −

2013-09-11 01:15:45.069 demo[30378] Uppercase String :  WORLD
2013-09-11 01:15:45.070 demo[30378] Concatenated string:   HelloWorld
2013-09-11 01:15:45.070 demo[30378] Length of Str3 :  10
2013-09-11 01:15:45.070 demo[30378] Using initWithFormat:   Hello World

You can find a complete pst of Objective-C NSString related methods in NSString Class Reference.

Objective-C Structures

Objective-C arrays allow you to define type of variables that can hold several data items of the same kind but structure is another user-defined data type available in Objective-C programming which allows you to combine data items of different kinds.

Structures are used to represent a record, Suppose you want to keep track of your books in a pbrary. You might want to track the following attributes about each book −

Title

Author

Subject

Book ID

Defining a Structure

To define a structure, you must use the struct statement. The struct statement defines a new data type, with more than one member for your program. The format of the struct statement is this −

struct [structure tag] {
   member definition;
   member definition;
   ...
   member definition;
} [one or more structure variables];  

The structure tag is optional and each member definition is a normal variable definition, such as int i; or float f; or any other vapd variable definition. At the end of the structure s definition, before the final semicolon, you can specify one or more structure variables but it is optional. Here is the way you would declare the Book structure −

struct Books {
   NSString *title;
   NSString *author;
   NSString *subject;
   int   book_id;
} book;  

Accessing Structure Members

To access any member of a structure, we use the member access operator (.). The member access operator is coded as a period between the structure variable name and the structure member that we wish to access. You would use struct keyword to define variables of structure type. Following is the example to explain usage of structure −

Live Demo

#import <Foundation/Foundation.h>

struct Books {
   NSString *title;
   NSString *author;
   NSString *subject;
   int   book_id;
};
 
int main() {
   struct Books Book1;        /* Declare Book1 of type Book */
   struct Books Book2;        /* Declare Book2 of type Book */
 
   /* book 1 specification */
   Book1.title = @"Objective-C Programming";
   Book1.author = @"Nuha Ap"; 
   Book1.subject = @"Objective-C Programming Tutorial";
   Book1.book_id = 6495407;

   /* book 2 specification */
   Book2.title = @"Telecom Bilpng";
   Book2.author = @"Zara Ap";
   Book2.subject = @"Telecom Bilpng Tutorial";
   Book2.book_id = 6495700;
 
   /* print Book1 info */
   NSLog(@"Book 1 title : %@
", Book1.title);
   NSLog(@"Book 1 author : %@
", Book1.author);
   NSLog(@"Book 1 subject : %@
", Book1.subject);
   NSLog(@"Book 1 book_id : %d
", Book1.book_id);

   /* print Book2 info */
   NSLog(@"Book 2 title : %@
", Book2.title);
   NSLog(@"Book 2 author : %@
", Book2.author);
   NSLog(@"Book 2 subject : %@
", Book2.subject);
   NSLog(@"Book 2 book_id : %d
", Book2.book_id);

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 04:20:07.947 demo[20591] Book 1 title : Objective-C Programming
2013-09-14 04:20:07.947 demo[20591] Book 1 author : Nuha Ap
2013-09-14 04:20:07.947 demo[20591] Book 1 subject : Objective-C Programming Tutorial
2013-09-14 04:20:07.947 demo[20591] Book 1 book_id : 6495407
2013-09-14 04:20:07.947 demo[20591] Book 2 title : Telecom Bilpng
2013-09-14 04:20:07.947 demo[20591] Book 2 author : Zara Ap
2013-09-14 04:20:07.947 demo[20591] Book 2 subject : Telecom Bilpng Tutorial
2013-09-14 04:20:07.947 demo[20591] Book 2 book_id : 6495700

Structures as Function Arguments

You can pass a structure as a function argument in very similar way as you pass any other variable or pointer. You would access structure variables in the similar way as you have accessed in the above example −

Live Demo

#import <Foundation/Foundation.h>

struct Books {
   NSString *title;
   NSString *author;
   NSString *subject;
   int   book_id;
};

@interface SampleClass:NSObject
/* function declaration */
- (void) printBook:( struct Books) book ;
@end

@implementation SampleClass 

- (void) printBook:( struct Books) book {
   NSLog(@"Book title : %@
", book.title);
   NSLog(@"Book author : %@
", book.author);
   NSLog(@"Book subject : %@
", book.subject);
   NSLog(@"Book book_id : %d
", book.book_id);
}

@end

int main() {
   struct Books Book1;        /* Declare Book1 of type Book */
   struct Books Book2;        /* Declare Book2 of type Book */
 
   /* book 1 specification */
   Book1.title = @"Objective-C Programming";
   Book1.author = @"Nuha Ap"; 
   Book1.subject = @"Objective-C Programming Tutorial";
   Book1.book_id = 6495407;

   /* book 2 specification */
   Book2.title = @"Telecom Bilpng";
   Book2.author = @"Zara Ap";
   Book2.subject = @"Telecom Bilpng Tutorial";
   Book2.book_id = 6495700;
 
   SampleClass *sampleClass = [[SampleClass alloc]init];
   /* print Book1 info */
   [sampleClass printBook: Book1];

   /* Print Book2 info */
   [sampleClass printBook: Book2];

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 04:34:45.725 demo[8060] Book title : Objective-C Programming
2013-09-14 04:34:45.725 demo[8060] Book author : Nuha Ap
2013-09-14 04:34:45.725 demo[8060] Book subject : Objective-C Programming Tutorial
2013-09-14 04:34:45.725 demo[8060] Book book_id : 6495407
2013-09-14 04:34:45.725 demo[8060] Book title : Telecom Bilpng
2013-09-14 04:34:45.725 demo[8060] Book author : Zara Ap
2013-09-14 04:34:45.725 demo[8060] Book subject : Telecom Bilpng Tutorial
2013-09-14 04:34:45.725 demo[8060] Book book_id : 6495700

Pointers to Structures

You can define pointers to structures in very similar way as you define pointer to any other variable as follows −

struct Books *struct_pointer;

Now, you can store the address of a structure variable in the above-defined pointer variable. To find the address of a structure variable, place the & operator before the structure s name as follows −

struct_pointer = &Book1;

To access the members of a structure using a pointer to that structure, you must use the -> operator as follows −

struct_pointer->title;

Let us re-write above example using structure pointer, hope this will be easy for you to understand the concept −

Live Demo

#import <Foundation/Foundation.h>

struct Books {
   NSString *title;
   NSString *author;
   NSString *subject;
   int   book_id;
};

@interface SampleClass:NSObject
/* function declaration */
- (void) printBook:( struct Books *) book ;
@end

@implementation SampleClass 
- (void) printBook:( struct Books *) book {
   NSLog(@"Book title : %@
", book->title);
   NSLog(@"Book author : %@
", book->author);
   NSLog(@"Book subject : %@
", book->subject);
   NSLog(@"Book book_id : %d
", book->book_id);
}

@end

int main() {
   struct Books Book1;        /* Declare Book1 of type Book */
   struct Books Book2;        /* Declare Book2 of type Book */
 
   /* book 1 specification */
   Book1.title = @"Objective-C Programming";
   Book1.author = @"Nuha Ap"; 
   Book1.subject = @"Objective-C Programming Tutorial";
   Book1.book_id = 6495407;

   /* book 2 specification */
   Book2.title = @"Telecom Bilpng";
   Book2.author = @"Zara Ap";
   Book2.subject = @"Telecom Bilpng Tutorial";
   Book2.book_id = 6495700;
 
   SampleClass *sampleClass = [[SampleClass alloc]init];
   /* print Book1 info by passing address of Book1 */
   [sampleClass printBook:&Book1];

   /* print Book2 info by passing address of Book2 */
   [sampleClass printBook:&Book2];

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 04:38:13.942 demo[20745] Book title : Objective-C Programming
2013-09-14 04:38:13.942 demo[20745] Book author : Nuha Ap
2013-09-14 04:38:13.942 demo[20745] Book subject : Objective-C Programming Tutorial
2013-09-14 04:38:13.942 demo[20745] Book book_id : 6495407
2013-09-14 04:38:13.942 demo[20745] Book title : Telecom Bilpng
2013-09-14 04:38:13.942 demo[20745] Book author : Zara Ap
2013-09-14 04:38:13.942 demo[20745] Book subject : Telecom Bilpng Tutorial
2013-09-14 04:38:13.942 demo[20745] Book book_id : 6495700

Bit Fields

Bit Fields allow the packing of data in a structure. This is especially useful when memory or data storage is at a premium. Typical examples −

Packing several objects into a machine word. e.g. 1 bit flags can be compacted.

Reading external file formats -- non-standard file formats could be read in. E.g. 9 bit integers.

Objective-C allows us do this in a structure definition by putting :bit length after the variable. For example −

struct packed_struct {
   unsigned int f1:1;
   unsigned int f2:1;
   unsigned int f3:1;
   unsigned int f4:1;
   unsigned int type:4;
   unsigned int my_int:9;
} pack;

Here, the packed_struct contains 6 members: Four 1 bit flags f1..f3, a 4 bit type and a 9 bit my_int.

Objective-C automatically packs the above bit fields as compactly as possible, provided that the maximum length of the field is less than or equal to the integer word length of the computer. If this is not the case, then some compilers may allow memory overlap for the fields whilst other would store the next field in the next word.

Objective-C Preprocessors

The Objective-C Preprocessor is not part of the compiler, but is a separate step in the compilation process. In simppstic terms, an Objective-C Preprocessor is just a text substitution tool and it instructs compiler to do required pre-processing before actual compilation. We ll refer to the Objective-C Preprocessor as the OCPP.

All preprocessor commands begin with a pound symbol (#). It must be the first nonblank character, and for readabipty, a preprocessor directive should begin in first column. Following section psts down all important preprocessor directives −

Sr.No.	Directive & Description
1	#define Substitutes a preprocessor macro
2	#include Inserts a particular header from another file
3	#undef Undefines a preprocessor macro
4	#ifdef Returns true if this macro is defined
5	#ifndef Returns true if this macro is not defined
6	#if Tests if a compile time condition is true
7	#else The alternative for #if
8	#epf #else an #if in one statement
9	#endif Ends preprocessor conditional
10	#error Prints error message on stderr
11	#pragma Issues special commands to the compiler using a standardized method

Preprocessors Examples

Analyze the following examples to understand various directives.

#define MAX_ARRAY_LENGTH 20

This directive tells the OCPP to replace instances of MAX_ARRAY_LENGTH with 20. Use #define for constants to increase readabipty.

#import <Foundation/Foundation.h>
#include "myheader.h"

These directives tell the OCPP to get foundation.h from Foundation Framework and add the text to the current source file. The next pne tells OCPP to get myheader.h from the local directory and add the content to the current source file.

#undef  FILE_SIZE
#define FILE_SIZE 42

This tells the OCPP to undefine existing FILE_SIZE and define it as 42.

#ifndef MESSAGE
   #define MESSAGE "You wish!"
#endif

This tells the OCPP to define MESSAGE only if MESSAGE isn t already defined.

#ifdef DEBUG
   /* Your debugging statements here */
#endif

This tells the OCPP to do the process the statements enclosed if DEBUG is defined. This is useful if you pass the -DDEBUG flag to gcc compiler at the time of compilation. This will define DEBUG, so you can turn debugging on and off on the fly during compilation.

Predefined Macros

ANSI C defines a number of macros. Although each one is available for your use in programming, the predefined macros should not be directly modified.

Sr.No.	Macro & Description
1	__DATE__ The current date as a character pteral in "MMM DD YYYY" format
2	__TIME__ The current time as a character pteral in "HH:MM:SS" format
3	__FILE__ This contains the current filename as a string pteral.
4	__LINE__ This contains the current pne number as a decimal constant.
5	__STDC__ Defined as 1 when the compiler comppes with the ANSI standard.

Let s try the following example −

Live Demo

#import <Foundation/Foundation.h>

int main() {
   NSLog(@"File :%s
", __FILE__ );
   NSLog(@"Date :%s
", __DATE__ );
   NSLog(@"Time :%s
", __TIME__ );
   NSLog(@"Line :%d
", __LINE__ );
   NSLog(@"ANSI :%d
", __STDC__ );
   
   return 0;
}

When the above code in a file main.m is compiled and executed, it produces the following result −

2013-09-14 04:46:14.859 demo[20683] File :main.m
2013-09-14 04:46:14.859 demo[20683] Date :Sep 14 2013
2013-09-14 04:46:14.859 demo[20683] Time :04:46:14
2013-09-14 04:46:14.859 demo[20683] Line :8
2013-09-14 04:46:14.859 demo[20683] ANSI :1

Preprocessor Operators

The Objective-C preprocessor offers following operators to help you in creating macros −

Macro Continuation ()

A macro usually must be contained on a single pne. The macro continuation operator is used to continue a macro that is too long for a single pne. For example −

#define  message_for(a, b)  
   NSLog(@#a " and " #b ": We love you!
")

Stringize (#)

The stringize or number-sign operator ( # ), when used within a macro definition, converts a macro parameter into a string constant. This operator may be used only in a macro that has a specified argument or parameter pst. For example −

Live Demo

#import <Foundation/Foundation.h>

#define  message_for(a, b)  
   NSLog(@#a " and " #b ": We love you!
")

int main(void) {
   message_for(Carole, Debra);
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 05:46:14.859 demo[20683] Carole and Debra: We love you!

Token Pasting (##)

The token-pasting operator (##) within a macro definition combines two arguments. It permits two separate tokens in the macro definition to be joined into a single token. For example −

Live Demo

#import <Foundation/Foundation.h>

#define tokenpaster(n) NSLog (@"token" #n " = %d", token##n)

int main(void) {
   int token34 = 40;
   
   tokenpaster(34);
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 05:48:14.859 demo[20683] token34 = 40

How it happened, because this example results in the following actual output from the preprocessor −

NSLog (@"token34 = %d", token34);

This example shows the concatenation of token##n into token34 and here we have used both stringize and token-pasting.

The defined() Operator

The preprocessor defined operator is used in constant expressions to determine if an identifier is defined using #define. If the specified identifier is defined, the value is true (non-zero). If the symbol is not defined, the value is false (zero). The defined operator is specified as follows −

Live Demo

#import <Foundation/Foundation.h>

#if !defined (MESSAGE)
   #define MESSAGE "You wish!"
#endif

int main(void) {
   NSLog(@"Here is the message: %s
", MESSAGE);  
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 05:48:19.859 demo[20683] Here is the message: You wish!

Parameterized Macros

One of the powerful functions of the OCPP is the abipty to simulate functions using parameterized macros. For example, we might have some code to square a number as follows −

int square(int x) {
   return x * x;
}

We can rewrite above code using a macro as follows −

#define square(x) ((x) * (x))

Macros with arguments must be defined using the #define directive before they can be used. The argument pst is enclosed in parentheses and must immediately follow the macro name. Spaces are not allowed between macro name and open parenthesis. For example −

Live Demo

#import <Foundation/Foundation.h>

#define MAX(x,y) ((x) > (y) ? (x) : (y))

int main(void) {
   NSLog(@"Max between 20 and 10 is %d
", MAX(10, 20));  
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-14 05:52:15.859 demo[20683] Max between 20 and 10 is 20

Objective-C Typedef

The Objective-C programming language provides a keyword called typedef, which you can use to give a type a new name. Following is an example to define a term BYTE for one-byte numbers −

typedef unsigned char BYTE;

After this type definition, the identifier BYTE can be used as an abbreviation for the type unsigned char, for example:.

BYTE  b1, b2;

By convention, uppercase letters are used for these definitions to remind the user that the type name is really a symbopc abbreviation, but you can use lowercase, as follows −

typedef unsigned char byte;

You can use typedef to give a name to user-defined data type as well. For example, you can use typedef with structure to define a new data type and then use that data type to define structure variables directly as follows −

Live Demo

#import <Foundation/Foundation.h>

typedef struct Books {
   NSString *title;
   NSString *author;
   NSString *subject;
   int book_id;
} Book;
 
int main() {
   Book book;
   book.title = @"Objective-C Programming";
   book.author = @"TutorialsPoint";
   book.subject = @"Programming tutorial";
   book.book_id = 100;
   
   NSLog( @"Book title : %@
", book.title);
   NSLog( @"Book author : %@
", book.author);
   NSLog( @"Book subject : %@
", book.subject);
   NSLog( @"Book Id : %d
", book.book_id);

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-12 12:21:53.745 demo[31183] Book title : Objective-C Programming
2013-09-12 12:21:53.745 demo[31183] Book author : TutorialsPoint
2013-09-12 12:21:53.745 demo[31183] Book subject : Programming tutorial
2013-09-12 12:21:53.745 demo[31183] Book Id : 100

typedef vs #define

The #define is a Objective-C directive, which is also used to define the apases for various data types similar to typedef but with following differences −

The typedef is pmited to giving symbopc names to types only whereas #define can be used to define apas for values as well, pke you can define 1 as ONE, etc.

The typedef interpretation is performed by the compiler where as #define statements are processed by the pre-processor.

Following is a simplest usage of #define −

Live Demo

#import <Foundation/Foundation.h>
 
#define TRUE  1
#define FALSE 0
 
int main( ) {
   NSLog( @"Value of TRUE : %d
", TRUE);
   NSLog( @"Value of FALSE : %d
", FALSE);

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-12 12:23:37.993 demo[5160] Value of TRUE : 1
2013-09-12 12:23:37.994 demo[5160] Value of FALSE : 0

Objective-C Type Casting

Type casting is a way to convert a variable from one data type to another data type. For example, if you want to store a long value into a simple integer then you can type cast long to int. You can convert values from one type to another exppcitly using the cast operator as follows −

(type_name) expression

In Objective-C, we generally use CGFloat for doing floating point operation, which is derived from basic type of float in case of 32-bit and double in case of 64-bit. Consider the following example where the cast operator causes the spanision of one integer variable by another to be performed as a floating-point operation −

Live Demo

#import <Foundation/Foundation.h>

int main() {
   int sum = 17, count = 5;
   CGFloat mean;

   mean = (CGFloat) sum / count;
   NSLog(@"Value of mean : %f
", mean );

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-11 01:35:40.047 demo[20634] Value of mean : 3.400000

It should be noted here that the cast operator has precedence over spanision, so the value of sum is first converted to type double and finally it gets spanided by count yielding a double value.

Type conversions can be imppcit which is performed by the compiler automatically or it can be specified exppcitly through the use of the cast operator. It is considered good programming practice to use the cast operator whenever type conversions are necessary.

Integer Promotion

Integer promotion is the process by which values of integer type "smaller" than int or unsigned int are converted either to int or unsigned int. Consider an example of adding a character in an int −

Live Demo

#import <Foundation/Foundation.h>

int main() {
   int  i = 17;
   char c =  c ;  /* ascii value is 99 */
   int sum;

   sum = i + c;
   NSLog(@"Value of sum : %d
", sum );

   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-11 01:38:28.492 demo[980] Value of sum : 116

Here, value of sum is coming as 116 because compiler is doing integer promotion and converting the value of c to ascii before performing actual addition operation.

Usual Arithmetic Conversion

The usual arithmetic conversions are imppcitly performed to cast their values in a common type. Compiler first performs integer promotion, if operands still have different types then they are converted to the type that appears highest in the following hierarchy −

The usual arithmetic conversions are not performed for the assignment operators, nor for the logical operators && and ||. Let us take following example to understand the concept −

Live Demo

#import <Foundation/Foundation.h>

int main() {
   int  i = 17;
   char c =  c ;  /* ascii value is 99 */
   CGFloat sum;

   sum = i + c;
   NSLog(@"Value of sum : %f
", sum );
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-11 01:41:39.192 demo[15351] Value of sum : 116.000000

Here, it is simple to understand that first c gets converted to integer but because final value is float, so usual arithmetic conversion apppes and compiler converts i and c into float and add them yielding a float result.

Objective-C Log Handpng

NSLog method

In order to print logs, we use the NSLog method in Objective-C programming language which we have used right from the Hello World example.

Let us look at a simple code that would print the words "Hello World" −

Live Demo

#import <Foundation/Foundation.h>

int main() {
   NSLog(@"Hello, World! 
");
   return 0;
}

Now, when we compile and run the program, we will get the following result.

2013-09-16 00:32:50.888 demo[16669] Hello, World! 

Disabpng logs in Live apps

Since the NSLogs we use in our apppcation, it will be printed in logs of device and it is not good to print logs in a pve build. Hence, we use a type definition for printing logs and we can use them as shown below.

Live Demo

#import <Foundation/Foundation.h>

#if DEBUG == 0
#define DebugLog(...)
#epf DEBUG == 1
#define DebugLog(...) NSLog(__VA_ARGS__)
#endif

int main() {
   DebugLog(@"Debug log, our custom addition gets 
   printed during debug only" );
   NSLog(@"NSLog gets printed always" );     
   return 0;
}

Now, when we compile and run the program in debug mode, we will get the following result.

2013-09-11 02:47:07.723 demo[618] Debug log, our custom addition gets printed during debug only
2013-09-11 02:47:07.723 demo[618] NSLog gets printed always

Now, when we compile and run the program in release mode, we will get the following result.

2013-09-11 02:47:45.248 demo[3158] NSLog gets printed always

Objective-C Error Handpng

In Objective-C programming, error handpng is provided with NSError class available in Foundation framework.

An NSError object encapsulates richer and more extensible error information than is possible using only an error code or error string. The core attributes of an NSError object are an error domain (represented by a string), a domain-specific error code and a user info dictionary containing apppcation specific information.

NSError

Objective-C programs use NSError objects to convey information about runtime errors that users need to be informed about. In most cases, a program displays this error information in a dialog or sheet. But it may also interpret the information and either ask the user to attempt to recover from the error or attempt to correct the error on its own

NSError Object consists of −

Domain − The error domain can be one of the predefined NSError domains or an arbitrary string describing a custom domain and domain must not be nil.

Code − The error code for the error.

User Info − The userInfo dictionary for the error and userInfo may be nil.

The following example shows how to create a custom error

NSString *domain = @"com.MyCompany.MyApppcation.ErrorDomain";
NSString *desc = NSLocapzedString(@"Unable to complete the process", @"");
NSDictionary *userInfo = @{ NSLocapzedDescriptionKey : desc };
NSError *error = [NSError errorWithDomain:domain code:-101 userInfo:userInfo];

Here is complete code of the above error sample passed as reference to an pointer −

Live Demo

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject
-(NSString *) getEmployeeNameForID:(int) id withError:(NSError **)errorPtr;
@end

@implementation SampleClass

-(NSString *) getEmployeeNameForID:(int) id withError:(NSError **)errorPtr {
   if(id == 1) {
      return @"Employee Test Name";
   } else {
      NSString *domain = @"com.MyCompany.MyApppcation.ErrorDomain";
      NSString *desc =@"Unable to complete the process";
      NSDictionary *userInfo = [[NSDictionary alloc] 
      initWithObjectsAndKeys:desc,
      @"NSLocapzedDescriptionKey",NULL];  
      *errorPtr = [NSError errorWithDomain:domain code:-101 
      userInfo:userInfo];
      return @"";
   }
}

@end

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   SampleClass *sampleClass = [[SampleClass alloc]init];
   NSError *error = nil;
   NSString *name1 = [sampleClass getEmployeeNameForID:1 withError:&error];
  
   if(error) {
      NSLog(@"Error finding Name1: %@",error);
   } else {
      NSLog(@"Name1: %@",name1);
   }
   
   error = nil;
   NSString *name2 = [sampleClass getEmployeeNameForID:2 withError:&error];

   if(error) {
      NSLog(@"Error finding Name2: %@",error);
   } else {
      NSLog(@"Name2: %@",name2);
   }

   [pool drain];
   return 0; 
}

In the above example, we return a name if the id is 1, otherwise we set the user-defined error object.

When the above code is compiled and executed, it produces the following result −

2013-09-14 18:01:00.809 demo[27632] Name1: Employee Test Name
2013-09-14 18:01:00.809 demo[27632] Error finding Name2: Unable to complete the process

Command-Line Arguments

It is possible to pass some values from the command pne to your Objective-C programs when they are executed. These values are called command pne arguments and many times they are important for your program, especially when you want to control your program from outside instead of hard coding those values inside the code.

The command pne arguments are handled using main() function arguments where argc refers to the number of arguments passed, and argv[] is a pointer array, which points to each argument passed to the program. Following is a simple example, which checks if there is any argument suppped from the command pne and take action accordingly −

#import <Foundation/Foundation.h>

int main( int argc, char *argv[] ) {
   if( argc == 2 ) {
      NSLog(@"The argument suppped is %s
", argv[1]);
   } else if( argc > 2 ) {
      NSLog(@"Too many arguments suppped.
");
   } else {
      NSLog(@"One argument expected.
");
   }
}

When the above code is compiled and executed with a single argument, say "testing", it produces the following result.

2013-09-13 03:01:17.333 demo[7640] The argument suppped is testing

When the above code is compiled and executed with two arguments, say testing1 and testing2, it produces the following result.

2013-09-13 03:01:18.333 demo[7640] Too many arguments suppped.

When the above code is compiled and executed without passing any argument, it produces the following result.

2013-09-13 03:01:18.333 demo[7640] One argument expected

It should be noted that argv[0] holds the name of the program itself and argv[1] is a pointer to the first command-pne argument suppped, and *argv[n] is the last argument. If no arguments are suppped, argc will be one, otherwise if you pass one argument, then argc is set at 2.

You pass all the command pne arguments separated by a space, but if argument itself has a space, then you can pass such arguments by putting them inside double quotes "" or single quotes . Let us re-write above example once again where we will print program name and we also pass a command-pne argument by putting inside double quotes −

Live Demo

#import <Foundation/Foundation.h>

int main( int argc, char *argv[] ) {
   NSLog(@"Program name %s
", argv[0]);
 
   if( argc == 2 ) {
      NSLog(@"The argument suppped is %s
", argv[1]);
   } else if( argc > 2 ) {
      NSLog(@"Too many arguments suppped.
");
   } else {
      NSLog(@"One argument expected.
");
   }
   
   return 0;
}

When the above code is compiled and executed with a single argument separated by space but inside double quotes say "Testing1 Testing2", it produces the following result.

2017-11-30 06:36:59.081 main[71010] Program name main
2017-11-30 06:36:59.082 main[71010] One argument expected.

Objective-C Classes & Objects

The main purpose of Objective-C programming language is to add object orientation to the C programming language and classes are the central feature of Objective-C that support object-oriented programming and are often called user-defined types.

A class is used to specify the form of an object and it combines data representation and methods for manipulating that data into one neat package. The data and methods within a class are called members of the class.

Objective-C characteristics

The class is defined in two different sections namely @interface and @implementation.

Almost everything is in form of objects.

Objects receive messages and objects are often referred as receivers.

Objects contain instance variables.

Objects and instance variables have scope.

Classes hide an object s implementation.

Properties are used to provide access to class instance variables in other classes.

Objective-C Class Definitions

When you define a class, you define a blueprint for a data type. This doesn t actually define any data, but it does define what the class name means, that is, what an object of the class will consist of and what operations can be performed on such an object.

A class definition starts with the keyword @interface followed by the interface(class) name; and the class body, enclosed by a pair of curly braces. In Objective-C, all classes are derived from the base class called NSObject. It is the superclass of all Objective-C classes. It provides basic methods pke memory allocation and initiapzation. For example, we defined the Box data type using the keyword class as follows −

@interface Box:NSObject {
   //Instance variables
   double length;    // Length of a box
   double breadth;   // Breadth of a box
}
@property(nonatomic, readwrite) double height;  // Property

@end

The instance variables are private and are only accessible inside the class implementation.

Allocating and initiapzing Objective-C Objects

A class provides the blueprints for objects, so basically an object is created from a class. We declare objects of a class with exactly the same sort of declaration that we declare variables of basic types. Following statements declare two objects of class Box −

Box box1 = [[Box alloc]init];     // Create box1 object of type Box
Box box2 = [[Box alloc]init];     // Create box2 object of type Box

Both of the objects box1 and box2 will have their own copy of data members.

Accessing the Data Members

The properties of objects of a class can be accessed using the direct member access operator (.). Let us try the following example to make things clear −

Live Demo

#import <Foundation/Foundation.h>

@interface Box:NSObject {
   double length;    // Length of a box
   double breadth;   // Breadth of a box
   double height;    // Height of a box
}

@property(nonatomic, readwrite) double height;  // Property
-(double) volume;
@end

@implementation Box

@synthesize height; 

-(id)init {
   self = [super init];
   length = 1.0;
   breadth = 1.0;
   return self;
}

-(double) volume {
   return length*breadth*height;
}

@end

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];    
   Box *box1 = [[Box alloc]init];    // Create box1 object of type Box
   Box *box2 = [[Box alloc]init];    // Create box2 object of type Box

   double volume = 0.0;             // Store the volume of a box here
 
   // box 1 specification
   box1.height = 5.0; 

   // box 2 specification
   box2.height = 10.0;
  
   // volume of box 1
   volume = [box1 volume];
   NSLog(@"Volume of Box1 : %f", volume);
   
   // volume of box 2
   volume = [box2 volume];
   NSLog(@"Volume of Box2 : %f", volume);
   
   [pool drain];
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-22 21:25:33.314 ClassAndObjects[387:303] Volume of Box1 : 5.000000
2013-09-22 21:25:33.316 ClassAndObjects[387:303] Volume of Box2 : 10.000000

Properties

Properties are introduced in Objective-C to ensure that the instance variable of the class can be accessed outside the class.

The various parts are the property declaration are as follows.

Properties begin with @property, which is a keyword

It is followed with access specifiers, which are nonatomic or atomic, readwrite or readonly and strong, unsafe_unretained or weak. This varies based on the type of the variable. For any pointer type, we can use strong, unsafe_unretained or weak. Similarly for other types we can use readwrite or readonly.

This is followed by the datatype of the variable.

Finally, we have the property name terminated by a semicolon.

We can add synthesize statement in the implementation class. But in the latest XCode, the synthesis part is taken care by the XCode and you need not include synthesize statement.

It is only possible with the properties we can access the instance variables of the class. Actually, internally getter and setter methods are created for the properties.

For example, let s assume we have a property @property (nonatomic ,readonly ) BOOL isDone. Under the hood, there are setters and getters created as shown below.

-(void)setIsDone(BOOL)isDone;
-(BOOL)isDone;

Objective-C Inheritance

One of the most important concepts in object-oriented programming is that of inheritance. Inheritance allows us to define a class in terms of another class which makes it easier to create and maintain an apppcation. This also provides an opportunity to reuse the code functionapty and fast implementation time.

When creating a class, instead of writing completely new data members and member functions, the programmer can designate that the new class should inherit the members of an existing class. This existing class is called the base class, and the new class is referred to as the derived class.

The idea of inheritance implements the is a relationship. For example, mammal IS-A animal, dog IS-A mammal, hence dog IS-A animal as well and so on.

Base & Derived Classes

Objective-C allows only multilevel inheritance, i.e., it can have only one base class but allows multilevel inheritance. All classes in Objective-C is derived from the superclass NSObject.

@interface derived-class: base-class

Consider a base class Person and its derived class Employee as follows −

Live Demo

#import <Foundation/Foundation.h>
 
@interface Person : NSObject {
   NSString *personName;
   NSInteger personAge;
}

- (id)initWithName:(NSString *)name andAge:(NSInteger)age;
- (void)print;

@end

@implementation Person

- (id)initWithName:(NSString *)name andAge:(NSInteger)age {
   personName = name;
   personAge = age;
   return self;
}

- (void)print {
   NSLog(@"Name: %@", personName);
   NSLog(@"Age: %ld", personAge);
}

@end

@interface Employee : Person {
   NSString *employeeEducation;
}

- (id)initWithName:(NSString *)name andAge:(NSInteger)age 
  andEducation:(NSString *)education;
- (void)print;
@end

@implementation Employee

- (id)initWithName:(NSString *)name andAge:(NSInteger)age 
   andEducation: (NSString *)education {
      personName = name;
      personAge = age;
      employeeEducation = education;
      return self;
   }

- (void)print {
   NSLog(@"Name: %@", personName);
   NSLog(@"Age: %ld", personAge);
   NSLog(@"Education: %@", employeeEducation);
}

@end

int main(int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];        
   NSLog(@"Base class Person Object");
   Person *person = [[Person alloc]initWithName:@"Raj" andAge:5];
   [person print];
   NSLog(@"Inherited Class Employee Object");
   Employee *employee = [[Employee alloc]initWithName:@"Raj" 
   andAge:5 andEducation:@"MBA"];
   [employee print];        
   [pool drain];
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-22 21:20:09.842 Inheritance[349:303] Base class Person Object
2013-09-22 21:20:09.844 Inheritance[349:303] Name: Raj
2013-09-22 21:20:09.844 Inheritance[349:303] Age: 5
2013-09-22 21:20:09.845 Inheritance[349:303] Inherited Class Employee Object
2013-09-22 21:20:09.845 Inheritance[349:303] Name: Raj
2013-09-22 21:20:09.846 Inheritance[349:303] Age: 5
2013-09-22 21:20:09.846 Inheritance[349:303] Education: MBA

Access Control and Inheritance

A derived class can access all the private members of its base class if it s defined in the interface class, but it cannot access private members that are defined in the implementation file.

We can summarize the different access types according to who can access them in the following way −

A derived class inherits all base class methods and variables with the following exceptions −

Variables declared in implementation file with the help of extensions is not accessible.

Methods declared in implementation file with the help of extensions is not accessible.

In case the inherited class implements the method in base class, then the method in derived class is executed.

Objective-C Polymorphism

The word polymorphism means having many forms. Typically, polymorphism occurs when there is a hierarchy of classes and they are related by inheritance.

Objective-C polymorphism means that a call to a member function will cause a different function to be executed depending on the type of object that invokes the function.

Consider the example, we have a class Shape that provides the basic interface for all the shapes. Square and Rectangle are derived from the base class Shape.

We have the method printArea that is going to show about the OOP feature polymorphism.

Live Demo

#import <Foundation/Foundation.h>

@interface Shape : NSObject {
   CGFloat area;
}

- (void)printArea;
- (void)calculateArea;
@end

@implementation Shape
- (void)printArea {
   NSLog(@"The area is %f", area);
}

- (void)calculateArea {

}

@end

@interface Square : Shape {
   CGFloat length;
}

- (id)initWithSide:(CGFloat)side;
- (void)calculateArea;

@end

@implementation Square
- (id)initWithSide:(CGFloat)side {
   length = side;
   return self;
}

- (void)calculateArea {
   area = length * length;
}

- (void)printArea {
   NSLog(@"The area of square is %f", area);
}

@end

@interface Rectangle : Shape {
   CGFloat length;
   CGFloat breadth;
}

- (id)initWithLength:(CGFloat)rLength andBreadth:(CGFloat)rBreadth;
@end

@implementation Rectangle
- (id)initWithLength:(CGFloat)rLength andBreadth:(CGFloat)rBreadth {
   length = rLength;
   breadth = rBreadth;
   return self;
}

- (void)calculateArea {
   area = length * breadth;
}

@end

int main(int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   Shape *square = [[Square alloc]initWithSide:10.0];
   [square calculateArea];
   [square printArea];
   Shape *rect = [[Rectangle alloc]
   initWithLength:10.0 andBreadth:5.0];
   [rect calculateArea];
   [rect printArea];        
   [pool drain];
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-22 21:21:50.785 Polymorphism[358:303] The area of square is 100.000000
2013-09-22 21:21:50.786 Polymorphism[358:303] The area is 50.000000

In the above example based on the availabipty of the method calculateArea and printArea, either the method in the base class or the derived class executed.

Polymorphism handles the switching of methods between the base class and derived class based on the method implementation of the two classes.

Objective-C Data Encapsulation

All Objective-C programs are composed of the following two fundamental elements −

Program statements (code) − This is the part of a program that performs actions and they are called methods.

Program data − The data is the information of the program which is affected by the program functions.

Encapsulation is an Object-Oriented Programming concept that binds together the data and functions that manipulate the data and that keeps both safe from outside interference and misuse. Data encapsulation led to the important OOP concept of data hiding.

Data encapsulation is a mechanism of bundpng the data and the functions that use them, and data abstraction is a mechanism of exposing only the interfaces and hiding the implementation details from the user.

Objective-C supports the properties of encapsulation and data hiding through the creation of user-defined types, called classes. For example −

@interface Adder : NSObject {
   NSInteger total;
}

- (id)initWithInitialNumber:(NSInteger)initialNumber;
- (void)addNumber:(NSInteger)newNumber;
- (NSInteger)getTotal;

@end

The variable total is private and we cannot access from outside the class. This means that they can be accessed only by other members of the Adder class and not by any other part of your program. This is one way encapsulation is achieved.

Methods inside the interface file are accessible and are pubpc in scope.

There are private methods, which are written with the help of extensions, which we will learn in upcoming chapters.

Data Encapsulation Example

Any Objective-C program where you implement a class with pubpc and private members variables is an example of data encapsulation and data abstraction. Consider the following example −

Live Demo

#import <Foundation/Foundation.h>

@interface Adder : NSObject {
   NSInteger total;
}

- (id)initWithInitialNumber:(NSInteger)initialNumber;
- (void)addNumber:(NSInteger)newNumber;
- (NSInteger)getTotal;

@end

@implementation Adder
-(id)initWithInitialNumber:(NSInteger)initialNumber {
   total = initialNumber;
   return self;
}

- (void)addNumber:(NSInteger)newNumber {
   total = total + newNumber;
}

- (NSInteger)getTotal {
   return total;
}

@end

int main(int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];        
   Adder *adder = [[Adder alloc]initWithInitialNumber:10];
   [adder addNumber:5];
   [adder addNumber:4];
   
   NSLog(@"The total is %ld",[adder getTotal]);
   [pool drain];
   return 0;
}

When the above code is compiled and executed, it produces the following result −

2013-09-22 21:17:30.485 DataEncapsulation[317:303] The total is 19

Above class adds numbers together and returns the sum. The pubpc members addNum and getTotal are the interfaces to the outside world and a user needs to know them to use the class. The private member total is something that is hidden from the outside world, but is needed for the class to operate properly.

Designing Strategy

Most of us have learned through bitter experience to make class members private by default unless we really need to expose them. That s just good encapsulation.

It s important to understand data encapsulation since it s one of the core features of all Object-Oriented Programming (OOP) languages including Objective-C.

Objective-C Categories

Sometimes, you may find that you wish to extend an existing class by adding behavior that is useful only in certain situations. In order add such extension to existing classes, Objective-C provides categories and extensions.

If you need to add a method to an existing class, perhaps, to add functionapty to make it easier to do something in your own apppcation, the easiest way is to use a category.

The syntax to declare a category uses the @interface keyword, just pke a standard Objective-C class description, but does not indicate any inheritance from a subclass. Instead, it specifies the name of the category in parentheses, pke this −

@interface ClassName (CategoryName)

@end

Characteristics of category

A category can be declared for any class, even if you don t have the original implementation source code.

Any methods that you declare in a category will be available to all instances of the original class, as well as any subclasses of the original class.

At runtime, there s no difference between a method added by a category and one that is implemented by the original class.

Now, let s look at a sample category implementation. Let s add a category to the Cocoa class NSString. This category will make it possible for us to add a new method getCopyRightString which helps us in returning the copyright string. It is shown below.

Live Demo

#import <Foundation/Foundation.h>

@interface NSString(MyAdditions)
+(NSString *)getCopyRightString;
@end

@implementation NSString(MyAdditions)

+(NSString *)getCopyRightString {
   return @"Copyright TutorialsPoint.com 2013";
}

@end

int main(int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   NSString *copyrightString = [NSString getCopyRightString];
   NSLog(@"Accessing Category: %@",copyrightString);
   
   [pool drain];
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-22 21:19:12.125 Categories[340:303] Accessing Category: Copyright TutorialsPoint.com 2013

Even though any methods added by a category are available to all instances of the class and its subclasses, you ll need to import the category header file in any source code file where you wish to use the additional methods, otherwise you ll run into compiler warnings and errors.

In our example, since we just have a single class, we have not included any header files, in such a case we should include the header files as said above.

Objective-C Posing

Before starting about Posing in Objective-C, I would pke to bring to your notice that Posing was declared deprecated in Mac OS X 10.5 and it s not available for use thereafter. So for those who are not concerned about these deprecated methods can skip this chapter.

Objective-C permits a class to wholly replace another class within a program. The replacing class is said to "pose as" the target class.

For the versions that supported posing, all messages sent to the target class are instead received by the posing class.

NSObject contains the poseAsClass: method that enables us to replace the existing class as said above.

Restrictions in Posing

A class may only pose as one of its direct or indirect superclasses.

The posing class must not define any new instance variables that are absent from the target class (though it may define or override methods).

The target class may not have received any messages prior to the posing.

A posing class can call overridden methods through super, thus incorporating the implementation of the target class.

A posing class can override methods defined in categories.

#import <Foundation/Foundation.h>

@interface MyString : NSString

@end

@implementation MyString

- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target
withString:(NSString *)replacement {
   NSLog(@"The Target string is %@",target);
   NSLog(@"The Replacement string is %@",replacement);
}

@end

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   [MyString poseAsClass:[NSString class]];
   NSString *string = @"Test";
   [string stringByReplacingOccurrencesOfString:@"a" withString:@"c"];
   
   [pool drain];
   return 0;
}

Now when we compile and run the program in a older Mac OS X (V_10.5 or earper), we will get the following result.

2013-09-22 21:23:46.829 Posing[372:303] The Target string is a
2013-09-22 21:23:46.830 Posing[372:303] The Replacement string is c

In the above example, we just polluted the original method with our implementation and this will get affected throughout all the NSString operations with the above method.

Objective-C Extensions

A class extension bears some similarity to a category, but it can only be added to a class for which you have the source code at compile time (the class is compiled at the same time as the class extension).

The methods declared by a class extension are implemented in the implementation block for the original class, so you can t, for example, declare a class extension on a framework class, such as a Cocoa or Cocoa Touch class pke NSString.

Extensions are actually categories without the category name. It s often referred as anonymous categories.

The syntax to declare a extension uses the @interface keyword, just pke a standard Objective-C class description, but does not indicate any inheritance from a subclass. Instead, it just adds parentheses, as shown below −

@interface ClassName ()

@end

Characteristics of extensions

An extension cannot be declared for any class, only for the classes that we have original implementation of source code.

An extension is adding private methods and private variables that are only specific to the class.

Any method or variable declared inside the extensions is not accessible even to the inherited classes.

Extensions Example

Let s create a class SampleClass that has an extension. In the extension, let s have a private variable internalID.

Then, let s have a method getExternalID that returns the externalID after processing the internalID.

The example is shown below and this wont work on onpne compiler.

#import <Foundation/Foundation.h>

@interface SampleClass : NSObject {
   NSString *name;
}

- (void)setInternalID;
- (NSString *)getExternalID;

@end

@interface SampleClass() {
   NSString *internalID;
}

@end

@implementation SampleClass

- (void)setInternalID {
   internalID = [NSString stringWithFormat: 
   @"UNIQUEINTERNALKEY%dUNIQUEINTERNALKEY",arc4random()%100];
}

- (NSString *)getExternalID {
   return [internalID stringByReplacingOccurrencesOfString: 
   @"UNIQUEINTERNALKEY" withString:@""];
}

@end

int main(int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   SampleClass *sampleClass = [[SampleClass alloc]init];
   [sampleClass setInternalID];
   NSLog(@"ExternalID: %@",[sampleClass getExternalID]);        
   [pool drain];
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-22 21:18:31.754 Extensions[331:303] ExternalID: 51

In the above example, we can see that the internalID is not returned directly. We here remove the UNIQUEINTERNALKEY and only make the remaining value available to the method getExternalID.

The above example just uses a string operation, but it can have many features pke encryption/decryption and so on.

Objective-C Protocols

Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. Protocols are implemented in the classes conforming to the protocol.

A simple example would be a network URL handpng class, it will have a protocol with methods pke processCompleted delegate method that intimates the calpng class once the network URL fetching operation is over.

A syntax of protocol is shown below.

@protocol ProtocolName
@required
// pst of required methods
@optional
// pst of optional methods
@end

The methods under keyword @required must be implemented in the classes that conforms to the protocol and the methods under @optional keyword are optional to implement.

Here is the syntax for class conforming to protocol

@interface MyClass : NSObject <MyProtocol>
...
@end

This means that any instance of MyClass will respond not only to the methods declared specifically in the interface, but that MyClass also provides implementations for the required methods in MyProtocol. There s no need to redeclare the protocol methods in the class interface - the adoption of the protocol is sufficient.

If you need a class to adopt multiple protocols, you can specify them as a comma-separated pst. We have a delegate object that holds the reference of the calpng object that implements the protocol.

An example is shown below.

Live Demo

#import <Foundation/Foundation.h>

@protocol PrintProtocolDelegate
- (void)processCompleted;

@end

@interface PrintClass :NSObject {
   id delegate;
}

- (void) printDetails;
- (void) setDelegate:(id)newDelegate;
@end

@implementation PrintClass
- (void)printDetails {
   NSLog(@"Printing Details");
   [delegate processCompleted];
}

- (void) setDelegate:(id)newDelegate {
   delegate = newDelegate;
}

@end

@interface SampleClass:NSObject<PrintProtocolDelegate>
- (void)startAction;

@end

@implementation SampleClass
- (void)startAction {
   PrintClass *printClass = [[PrintClass alloc]init];
   [printClass setDelegate:self];
   [printClass printDetails];
}

-(void)processCompleted {
   NSLog(@"Printing Process Completed");
}

@end

int main(int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   SampleClass *sampleClass = [[SampleClass alloc]init];
   [sampleClass startAction];
   [pool drain];
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-22 21:15:50.362 Protocols[275:303] Printing Details
2013-09-22 21:15:50.364 Protocols[275:303] Printing Process Completed

In the above example we have seen how the delgate methods are called and executed. Its starts with startAction, once the process is completed, the delegate method processCompleted is called to intimate the operation is completed.

In any iOS or Mac app, we will never have a program implemented without a delegate. So its important we understand the usage of delegates. Delegates objects should use unsafe_unretained property type to avoid memory leaks.

Objective-C Dynamic Binding

Dynamic binding is determining the method to invoke at runtime instead of at compile time. Dynamic binding is also referred to as late binding.

In Objective-C, all methods are resolved dynamically at runtime. The exact code executed is determined by both the method name (the selector) and the receiving object.

Dynamic binding enables polymorphism. For example, consider a collection of objects including Rectangle and Square. Each object has its own implementation of a printArea method.

In the following code fragment, the actual code that should be executed by the expression [anObject printArea] is determined at runtime. The runtime system uses the selector for the method run to identify the appropriate method in whatever class of anObject turns out to be.

Let us look at a simple code that would explain dynamic binding.

Live Demo

#import <Foundation/Foundation.h>

@interface Square:NSObject {
   float area;
}

- (void)calculateAreaOfSide:(CGFloat)side;
- (void)printArea;
@end

@implementation Square
- (void)calculateAreaOfSide:(CGFloat)side {
   area = side * side;
}

- (void)printArea {
   NSLog(@"The area of square is %f",area);
}

@end

@interface Rectangle:NSObject {
   float area;
}

- (void)calculateAreaOfLength:(CGFloat)length andBreadth:(CGFloat)breadth;
- (void)printArea;
@end

@implementation  Rectangle

- (void)calculateAreaOfLength:(CGFloat)length andBreadth:(CGFloat)breadth {
   area = length * breadth;
}

- (void)printArea {
   NSLog(@"The area of Rectangle is %f",area);
}

@end

int main() {
   Square *square = [[Square alloc]init];
   [square calculateAreaOfSide:10.0];
   
   Rectangle *rectangle = [[Rectangle alloc]init];
   [rectangle calculateAreaOfLength:10.0 andBreadth:5.0];
   
   NSArray *shapes = [[NSArray alloc]initWithObjects: square, rectangle,nil];
   id object1 = [shapes objectAtIndex:0];
   [object1 printArea];
   
   id object2 = [shapes objectAtIndex:1];
   [object2 printArea];
   
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-28 07:42:29.821 demo[4916] The area of square is 100.000000
2013-09-28 07:42:29.821 demo[4916] The area of Rectangle is 50.000000

As you can see in the above example, printArea method is dynamically selected in runtime. It is an example for dynamic binding and is quite useful in many situations when deapng with similar kind of objects.

Objective-C Composite Objects

We can create subclass within a class cluster that defines a class that embeds within it an object. These class objects are composite objects.

So you might be wondering what s a class cluster. So we will first see what s a class cluster.

Class Clusters

Class clusters are a design pattern that the Foundation framework makes extensive use of. Class clusters group a number of private concrete subclasses under a pubpc abstract superclass. The grouping of classes in this way simppfies the pubpcly visible architecture of an object-oriented framework without reducing its functional richness. Class clusters are based on the Abstract Factory design pattern.

To make it simple, instead of creating multiple classes for similar functions, we create a single class that will take care of its handpng based on the value of input.

For example, in NSNumber we have many clusters of classes pke char, int, bool and so on. We group all of them to a single class that takes care of handpng the similar operations in a single class. NSNumber actually wraps the value of these primitive types into objects.

So what s exactly composite object?

By embedding a private cluster object in an object of our own design, we create a composite object. This composite object can rely on the cluster object for its basic functionapty, only intercepting messages that the composite object wants to handle in some particular way. This architecture reduces the amount of code we must write and lets you take advantage of the tested code provided by the Foundation Framework.

This is explained in the following figure.

The composite object must declare itself to be a subclass of the cluster s abstract superclass. As a subclass, it must override the superclass primitive methods. It can also override derived methods, but this isn t necessary because the derived methods work through the primitive ones.

The count method of the NSArray class is an example; the intervening object s implementation of a method it overrides can be as simple as −

- (unsigned)count  {
   return [embeddedObject count];
}

In the above example, embedded object is actually of type NSArray.

A Composite Object example

Now in order to see a complete example, let s look at the example from the Apple documentation which is given below.

Live Demo

#import <Foundation/Foundation.h>

@interface VapdatingArray : NSMutableArray {
   NSMutableArray *embeddedArray;
}

+ vapdatingArray;
- init;
- (unsigned)count;
- objectAtIndex:(unsigned)index;
- (void)addObject:object;
- (void)replaceObjectAtIndex:(unsigned)index withObject:object;
- (void)removeLastObject;
- (void)insertObject:object atIndex:(unsigned)index;
- (void)removeObjectAtIndex:(unsigned)index;

@end

@implementation VapdatingArray
- init {
   self = [super init];
   if (self) {
      embeddedArray = [[NSMutableArray allocWithZone:[self zone]] init];
   }
   return self;
}

+ vapdatingArray {
   return [[self alloc] init] ;
}

- (unsigned)count {
   return [embeddedArray count];
}

- objectAtIndex:(unsigned)index {
   return [embeddedArray objectAtIndex:index];
}

- (void)addObject:(id)object {
   if (object != nil) {
      [embeddedArray addObject:object];
   }
}

- (void)replaceObjectAtIndex:(unsigned)index withObject:(id)object; {
   if (index <[embeddedArray count] && object != nil) {
      [embeddedArray replaceObjectAtIndex:index withObject:object];
   }
}

- (void)removeLastObject; {
   if ([embeddedArray count] > 0) {
      [embeddedArray removeLastObject];
   }
}

- (void)insertObject:(id)object atIndex:(unsigned)index; {
   if (object != nil) {
      [embeddedArray insertObject:object atIndex:index];
   }
}

- (void)removeObjectAtIndex:(unsigned)index; {
   if (index <[embeddedArray count]) {
      [embeddedArray removeObjectAtIndex:index];
   }
}

@end

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   VapdatingArray *vapdatingArray = [VapdatingArray vapdatingArray];
   
   [vapdatingArray addObject:@"Object1"];
   [vapdatingArray addObject:@"Object2"];
   [vapdatingArray addObject:[NSNull null]];
   [vapdatingArray removeObjectAtIndex:2];
   NSString *aString = [vapdatingArray objectAtIndex:1];
   NSLog(@"The value at Index 1 is %@",aString);
   [pool drain];
   
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-28 22:03:54.294 demo[6247] The value at Index 1 is Object2

In the above example, we can see that vapdating array s one function would not allow adding null objects that will lead to crash in the normal scenario. But our vapdating array takes care of it. Similarly, each of the method in vapdating array adds vapdating processes apart from the normal sequence of operations.

Obj-C Foundation Framework

If you refer Apple documentation, you can see the details of Foundation framework as given below.

The Foundation framework defines a base layer of Objective-C classes. In addition to providing a set of useful primitive object classes, it introduces several paradigms that define functionapty not covered by the Objective-C language. The Foundation framework is designed with these goals in mind −

Provide a small set of basic utipty classes.

Make software development easier by introducing consistent conventions for things such as deallocation.

Support Unicode strings, object persistence, and object distribution.

Provide a level of OS independence to enhance portabipty.

The framework was developed by NeXTStep, which was acquired by Apple and these foundation classes became part of Mac OS X and iOS.

Since it was developed by NeXTStep, it has class prefix of "NS".

We have used Foundation Framework in all our sample programs. It is almost a must to use Foundation Framework.

Generally, we use something pke #import <Foundation/NSString.h> to import a Objective-C class, but in order avoid importing too many classes, it s all imported in #import <Foundation/Foundation.h&gt.

NSObject is the base class of all objects including the foundation kit classes. It provides the methods for memory management. It also provides basic interface to the runtime system and abipty to behave as Objective-C objects. It doesn t have any base class and is the root for all classes.

Foundation Classes based on functionapty

Sr.No.	Loop Type & Description
1	Data storage NSArray, NSDictionary, and NSSet provide storage for Objective-C objects of any class.
2	Text and strings NSCharacterSet represents various groupings of characters that are used by the NSString and NSScanner classes. The NSString classes represent text strings and provide methods for searching, combining, and comparing strings. An NSScanner object is used to scan numbers and words from an NSString object.
3	Dates and times The NSDate, NSTimeZone, and NSCalendar classes store times and dates and represent calendrical information. They offer methods for calculating date and time differences. Together with NSLocale, they provide methods for displaying dates and times in many formats and for adjusting times and dates based on location in the world.
4	Exception handpng Exception handpng is used to handle unexpected situations and it s offered in Objective-C with NSException.
5	File handpng File handpng is done with the help of class NSFileManager.
6	URL loading system A set of classes and protocols that provide access to common Internet protocols.

Objective-C Fast Enumeration

Fast enumeration is an Objective-C s feature that helps in enumerating through a collection. So in order to know about fast enumeration, we need know about collection first which will be explained in the following section.

Collections in Objective-C

Collections are fundamental constructs. It is used to hold and manage other objects. The whole purpose of a collection is that it provides a common way to store and retrieve objects efficiently.

There are several different types of collections. While they all fulfil the same purpose of being able to hold other objects, they differ mostly in the way objects are retrieved. The most common collections used in Objective-C are −

NSSet

NSArray

NSDictionary

NSMutableSet

NSMutableArray

NSMutableDictionary

If you want to know more about these structures, please refer data storage in Foundation Framework.

Fast enumeration Syntax

for (classType variable in collectionObject ) { 
  statements 
}

Here is an example for fast enumeration.

Live Demo

#import <Foundation/Foundation.h>

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   NSArray *array = [[NSArray alloc]
   initWithObjects:@"string1", @"string2",@"string3",nil];
   
   for(NSString *aString in array) {
      NSLog(@"Value: %@",aString);
   }
   
   [pool drain];
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-28 06:26:22.835 demo[7426] Value: string1
2013-09-28 06:26:22.836 demo[7426] Value: string2
2013-09-28 06:26:22.836 demo[7426] Value: string3

As you can see in the output, each of the objects in the array is printed in an order.

Fast Enumeration Backwards

for (classType variable in [collectionObject reverseObjectEnumerator] ) { 
  statements 
}

Here is an example for reverseObjectEnumerator in fast enumeration.

Live Demo

#import <Foundation/Foundation.h>

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   NSArray *array = [[NSArray alloc]
   initWithObjects:@"string1", @"string2",@"string3",nil];
   
   for(NSString *aString in [array reverseObjectEnumerator]) {
      NSLog(@"Value: %@",aString);
   }
   
   [pool drain];
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-28 06:27:51.025 demo[12742] Value: string3
2013-09-28 06:27:51.025 demo[12742] Value: string2
2013-09-28 06:27:51.025 demo[12742] Value: string1

As you can see in the output, each of the objects in the array is printed but in the reverse order as compared to normal fast enumeration.

Obj-C Memory Management

Memory management is one of the most important process in any programming language. It is the process by which the memory of objects are allocated when they are required and deallocated when they are no longer required.

Managing object memory is a matter of performance; if an apppcation doesn t free unneeded objects, its memory footprint grows and performance suffers.

Objective-C Memory management techniques can be broadly classified into two types.

"Manual Retain-Release" or MRR

"Automatic Reference Counting" or ARC

"Manual Retain-Release" or MRR

In MRR, we exppcitly manage memory by keeping track of objects on our own. This is implemented using a model, known as reference counting, that the Foundation class NSObject provides in conjunction with the runtime environment.

The only difference between MRR and ARC is that the retain and release is handled by us manually in former while its automatically taken care of in the latter.

The following figure represents an example of how memory management work in Objective-C.

The memory pfe cycle of the Class A object is shown in the above figure. As you can see, the retain count is shown below the object, when the retain count of an object becomes 0, the object is freed completely and its memory is deallocated for other objects to use.

Class A object is first created using alloc/init method available in NSObject. Now, the retain count becomes 1.

Now, class B retains the Class A s Object and the retain count of Class A s object becomes 2.

Then, Class C makes a copy of the object. Now, it is created as another instance of Class A with same values for the instance variables. Here, the retain count is 1 and not the retain count of the original object. This is represented by the dotted pne in the figure.

The copied object is released by Class C using the release method and the retain count becomes 0 and hence the object is destroyed.

In case of the initial Class A Object, the retain count is 2 and it has to be released twice in order for it to be destroyed. This is done by release statements of Class A and Class B which decrements the retain count to 1 and 0, respectively. Finally, the object is destroyed.

MRR Basic Rules

We own any object we create: We create an object using a method whose name begins with "alloc", "new", "copy", or "mutableCopy"

We can take ownership of an object using retain: A received object is normally guaranteed to remain vapd within the method it was received in, and that method may also safely return the object to its invoker. We use retain in two situations −

In the implementation of an accessor method or an init method, to take ownership of an object we want to store as a property value.

To prevent an object from being invapdated as a side-effect of some other operation.

When we no longer need it, we must repnquish ownership of an object we own: We repnquish ownership of an object by sending it a release message or an autorelease message. In Cocoa terminology, repnquishing ownership of an object is therefore typically referred to as "releasing" an object.

You must not repnquish ownership of an object you do not own: This is just corollary of the previous popcy rules stated exppcitly.

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject
- (void)sampleMethod;
@end

@implementation SampleClass
- (void)sampleMethod {
   NSLog(@"Hello, World! 
");
}

- (void)dealloc  {
  NSLog(@"Object deallocated");
  [super dealloc];
}

@end

int main() {
   
   /* my first program in Objective-C */
   SampleClass *sampleClass = [[SampleClass alloc]init];
   [sampleClass sampleMethod];
   
   NSLog(@"Retain Count after initial allocation: %d", 
   [sampleClass retainCount]);
   [sampleClass retain];
   
   NSLog(@"Retain Count after retain: %d", [sampleClass retainCount]);
   [sampleClass release];
   NSLog(@"Retain Count after release: %d", [sampleClass retainCount]);
   [sampleClass release];
   NSLog(@"SampleClass dealloc will be called before this");
   
   // Should set the object to nil
   sampleClass = nil;
   return 0;
}

When we compile the above program, we will get the following output.

2013-09-28 04:39:52.310 demo[8385] Hello, World!
2013-09-28 04:39:52.311 demo[8385] Retain Count after initial allocation: 1
2013-09-28 04:39:52.311 demo[8385] Retain Count after retain: 2
2013-09-28 04:39:52.311 demo[8385] Retain Count after release: 1
2013-09-28 04:39:52.311 demo[8385] Object deallocated
2013-09-28 04:39:52.311 demo[8385] SampleClass dealloc will be called before this

"Automatic Reference Counting" or ARC

In Automatic Reference Counting or ARC, the system uses the same reference counting system as MRR, but it inserts the appropriate memory management method calls for us at compile-time. We are strongly encouraged to use ARC for new projects. If we use ARC, there is typically no need to understand the underlying implementation described in this document, although it may in some situations be helpful. For more about ARC, see Transitioning to ARC Release Notes.

As mentioned above, in ARC, we need not add release and retain methods since that will be taken care by the compiler. Actually, the underlying process of Objective-C is still the same. It uses the retain and release operations internally making it easier for the developer to code without worrying about these operations, which will reduce both the amount of code written and the possibipty of memory leaks.

There was another principle called garbage collection, which is used in Mac OS-X along with MRR, but since its deprecation in OS-X Mountain Lion, it has not been discussed along with MRR. Also, iOS objects never had garbage collection feature. And with ARC, there is no use of garbage collection in OS-X too.

Here is a simple ARC example. Note this won t work on onpne compiler since it does not support ARC.

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject
- (void)sampleMethod;
@end

@implementation SampleClass
- (void)sampleMethod {
   NSLog(@"Hello, World! 
");
}

- (void)dealloc  {
  NSLog(@"Object deallocated");
}

@end

int main() {
   /* my first program in Objective-C */
   @autoreleasepool {
      SampleClass *sampleClass = [[SampleClass alloc]init];
      [sampleClass sampleMethod];
      sampleClass = nil;
   }
   return 0;
}

When we compile the above program, we will get the following output.

2013-09-28 04:45:47.310 demo[8385] Hello, World!
2013-09-28 04:45:47.311 demo[8385] Object deallocated

Previous Page Print Page Next Page   Advertisements