How to use the Protocol in Objective-c

InObjective-cHow to UseProtocolIs the content to be introduced in this article. It mainly introducesProtocolThis article introduces some concepts and operations of the Protocol. Let's take a look at the details first.

I. Protocol definition

 
 

  
  
@protocol test  
  
  
 
  
  
-void） testpocol：int）t；  
  
  
@end 
 
 

Ii. Protocol inheritance

H header file

 
 

  
  
# Import "test. h" import Protocol
  
  
@ Interface testViewController: UIViewController <test> {
  
  
// Id <test> testp;
  
  
}
 
 

M implementation file

 
 

  
  
@ Implementation testViewController
  
  
 
  
  
-Void) viewDidLoad {
  
  
[Super viewDidLoad];
  
  
// Class that calls the implementation method
  
  
Testdiaoyong * td = [[testdiaoyong alloc] init];
 
 

Td. testd = self; assign the Class Object of the current implementation protocol to the desired place

 
 

  
  
// You can also use the following method to transfer the Protocol
  
  
[Td setpoco: self]
  
  
}
  
  
 
  
  
-(Void) testpocol :( int) s {
  
  
NSLog (@ "testpocol... % d", s );
  
  
}
  
  
@ End
  
  
 
  
  
Iii. Call Protocol
  
  
 
  
  
@ Interface testdiaoyong: NSObject {
  
  
Id <test> testp;
  
  
}
  
  
 
  
  
-(Void) setpoco: t;
  
  
 
  
  
-(Void) setlen;
  
  
@ End
  
  
 
  
  
@ Implementation testdiaoyong
  
  
@ Synthesize testp;
  
  
 
  
  
// Protocol t can bear the type
  
  
 
  
  
-(Void) setpoco: t {
  
  
Self. testp = t;
  
  
}
  
  
 
  
  
-(Void) start {
  
  
[Testp testpocol: 99];
  
  
}
  
  
@ End
 
 

Summary: InObjective-cHow to UseProtocolI hope this article will help you.