Objective-C代理

 1 #import <Foundation/Foundation.h>
 2 #import "Boss.h"
 3 #import "Worker.h"
 4 
 5 int main(int argc, const char * argv[]) {
 6     @autoreleasepool {
 7 
 8         Boss * boss = [[Boss alloc] init];
 9         Worker * worker = [[Worker alloc] init];
10         [boss setDelegate:worker];
11         [boss delegateBuyMacbook];
12                 
13     }
14     return 0;
15 }

 1 #import <Foundation/Foundation.h>
 2 
 3 //创建协议
 4 @protocol BossDelegate <NSObject>
 5 
 6 - (void)buyMacbook;
 7 
 8 @end
 9 
10 
11 @interface Boss : NSObject
12 //有一个遵守协议的代理
13 @property (nonatomic,weak) id<BossDelegate> delegate;
14 //方法调用代理去买电脑
15 - (void)delegateBuyMacbook;
16 @end

1 #import "Boss.h"
2 
3 @implementation Boss
4 - (void)delegateBuyMacbook {
5     NSLog(@"老板开始找人买电脑");
6     [_delegate buyMacbook];
7 }
8 @end

1 #import <Foundation/Foundation.h>
2 #import "Boss.h"
3 @interface Worker : NSObject<BossDelegate>
4 
5 @end

1 #import "Worker.h"
2 
3 @implementation Worker
4 - (void)buyMacbook {
5     NSLog(@"买了60台Macbook Pro 15 高配");
6 }
7 @end