Class methods and Object methods for iOS development OC

First, let's take a look at what class methods and object methods are.

Object method:

The object is preceded by "-". such as:-(void) Runner;

Object methods can only be called by objects, such as:

@interface Person:nsobject

(void) Runner;//object method

@end;

int main ()

{

Person *p=[person New];//person is a class that creates an object p.

[P runner];//p Call Runner this method;

return 0;

{

The member variables of our current object can be accessed directly in the object method such as :

@interface Dog:nsobject

{

int _age;//member Variable

}

-(void) dogage;

@end

@implementation Dog

-(void) dogage{

_age=20;//direct access to member variables;

}

@end

Object methods introduced here ...

Class method:

The class method is preceded by "+" such as: + (void) Runner;

Can only be called by a class: for example:

@interface Person:nsobject

+ (void) Runner;//object method

@end;

int main ()

{

[Person Runner];

return 0;

{

Class methods do not need to use member variables, such as 2-digit and:

+ (int) sumN1: (int) n1 andN2: (int) n2;

The class method has the same name as the object method:

You can see that although the method name is the same, one is a class method that is an object method and can also be run.

Dead Loop:

@interface Person:nsobject

{

int age;

}

+ (void) test;

@end

As long as the call in the Mian method is a dead loop

+ (void) test

{

[Person Test];

}

Class methods and object methods can be called to each other:

Class methods and Object methods for iOS development OC