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Objective C

 

Objective C is used in iOS development. It is built on top of the C programming language and which offers object oriented capabilities and a dynamic runtime. It includes all familiar elements like as primitive types i.e. int, float, char etc. structures, pointers, functions, and control flow constructs.

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You can also use standard C library routines which are declared in stdlib.h and stdio.h. In interface file class is declared and in implementation file class is defined.

Suppose there is a class IntellipaatClass.h then its interface file is:

@interface IntellipaatClass:NSObject {

// Declaration of class variable

}

// Declaration of class properties

// Declaration of class methods and instance methods

@end

 The implementation file IntellipaatClass.m is as follows:

@implementation IntellipaatClass

// Class methods

@end

 

Methods

In Objective C method is declared as follows –

-(returnType)Method_Name:(type_Name) variable1 :(type_Name)variable2;

 

Create Object

In Objective C objects are created as follows:

IntellipaatClass  *object_Name = [[IntellipaatClass alloc]init] ;

 

Class methods do not contain any objects and variables related with it. They can be accessed directly without creating objects for the class. Example is as follows:

+(void)Class_Method;

It can be accessed by using the class name like as follows −

[IntellipaatClass ClassMethod];

 

Instance methods – It can be accessed only after creating an object for the class. Memory is allocated to the instance variables.

-(void)InstanceMethod;

They can be access after creating an object like as follows –

IntellipaatClass  *objectName = [[IntellipaatClass alloc]init] ;

[objectName InstanceMethod];

 

Example

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject -(void)sampleMethod;

@end

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

@end

int main() {

/* my first program in Objective-C */

SampleClass *sampleClass

= [[SampleClassalloc]init];

[sampleClasssampleMethod];

return 0;

}

 

Objects Communicate Through Messages

In Objective C one object sends a message to another object by calling a method on that object. If you have an object somePerson of class XYZPerson, you can send it the sayHello message like this:

Syntax:

[somePerson sayHello];

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