利用协议实现回调函数
[cpp] view plaincopyprint?
01.#import <UIKit/UIKit.h>   
02. 
03.@protocol myViewDelegate 
04. 
05.-(void) CallBackFun; 
06. 
07.@end 
#import <UIKit/UIKit.h>

@protocol myViewDelegate

-(void) CallBackFun;

@end

调用协议：论文网 

[cpp] view plaincopyprint?
01.#import <Foundation/Foundation.h>  
02.#import "myViewDelegate.h"  
03. 
04.@interface Test : NSObject{ 
05.    id<myViewDelegate> delegate;  
06.} 
07. 
08.@property(nonatomic,retain) id<myViewDelegate> delegate; 
09. 
10.-(void)callback; 
11. 
12.@end 
13.#import "Test.h"  
14. 
15.@implementation Test 
16.@synthesize delegate; 
17. 
18.-(id)init{ 
19.    NSLog(@"init!"); 
20.    return [super init]; 
21.} 
22. 
23.-(void)callback 
24.{ 
25.    NSLog(@"callbackInTest!"); 
26.    if (delegate!=nil) { 
27.        [delegate CallBackFun]; 
28.    } 
29. 
30.} 
31.@end 
#import <Foundation/Foundation.h>
#import "myViewDelegate.h"

@interface Test : NSObject{
    id<myViewDelegate> delegate;
}

@property(nonatomic,retain) id<myViewDelegate> delegate;

-(void)callback;

@end
#import "Test.h"

@implementation Test
@synthesize delegate;

-(id)init{
    NSLog(@"init!");
    return [super init];
}

-(void)callback
{
    NSLog(@"callbackInTest!");
    if (delegate!=nil) {
        [delegate CallBackFun];
    }

}
@end

实现协议，接受回调：

[cpp] view plaincopyprint?

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