OC8_代理基本概念

//
//  ProtectedDelegate.h
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>

@protocol ProtectedDelegate <NSObject>

- (void)bark;

@end

//
//  Person.h
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ProtectedDelegate.h"

@interface Person : NSObject
{
id <ProtectedDelegate>_delegate;
}//对象指针也要遵守协议

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

- (void)go;

@end

//
//  Person.m
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "Person.h"

@implementation Person

- (void)go
{
[_delegate bark];
}

@end

//
//  Cat.h
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ProtectedDelegate.h"//包含头文件

@interface Cat : NSObject <ProtectedDelegate>//遵守这个协议

@end

//
//  Cat.m
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "Cat.h"

@implementation Cat
- (void)bark
{
NSLog(@"Miao miao miao ...");
}
@end

//
//  Dog.h
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ProtectedDelegate.h"

@interface Dog : NSObject <ProtectedDelegate>

@end

//
//  Dog.m
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "Dog.h"

@implementation Dog

- (void)bark
{
NSLog(@"Wang wang wang ...");
}

@end

//
//  main.m
//  OC8_代理基本概念
//
//  Created by zhangxueming on 15/6/24.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"
#import "Cat.h"
#import "Person.h"

int main(int argc, const char * argv[]) {
@autoreleasepool {
Person *xiaoXin = [[Person alloc] init];
Dog *dog = [[Dog alloc] init];
xiaoXin.delegate = dog;
[xiaoXin go];
Cat *cat = [[Cat alloc] init];
xiaoXin.delegate = cat;
[xiaoXin go];
}
return 0;
}