1、协议

可以理解为java里面的接口

 

 

 

 

2、测试Demo

NSObject+chenyu.h

#ifndef NSObject_chenyu_h
#define NSObject_chenyu_h
#import <Foundation/Foundation.h>@interface NSObject(chenyu)
-(void)test;
@end#endif /* NSObject_chenyu_h */

 

Org.h

#ifndef Org_h#define Org_h#import <Foundation/Foundation.h>#import "NSObject+chenyu.h"@interface Org : NSObject@end#endif /* Org_h */

 

 

Org.m

#import <Foundation/Foundation.h>
#import "Org.h"
//#import "NSObject+chenyu.h"@implementation Org
//如果不实现协议中的方法会发生错误
-(void)test
{NSLog(@"this is org test method");
}
@end

 

 

 

main.m

#import "Org.h"int main(int argc, char * argv[]) {@autoreleasepool {Org *org = [Org new];[org test];}
}

 

 

 

 

 

3、运行结果

this is org test method