今天模拟Button的delegate来联系一下protocol。

Button类

//  Button.h

//  Protocal

//

//  Created by WildCat on 13-7-24.

//  Copyright (c) 2013年 wildcat. All rights reserved.

//

#import <Foundation/Foundation.h>

@class Button;

//定义一个协议

@protocol ButtonDelegate <NSObject>

-(void)onclick:(Button *) button;

@end

//定义一个类 如果要作为Button的代理一定要实现ButtonDelegate

@interface Button : NSObject

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

-(void)click;

@end

#import "Button.h"

@implementation Button

-(void)dealloc{

    //释放_gelegate

    [_delegate release];

    [super dealloc];

}

-(void)click{

    NSLog(@"调用onclick方法");

    [_delegate onclick:self];

}

@end

ButtonListener类

/  ButtonListener.h

//  Protocal

//

//  Created by WildCat on 13-7-24.

//  Copyright (c) 2013年 wildcat. All rights reserved.

//

#import <Foundation/Foundation.h>

@protocol ButtonDelegate;

@interface ButtonListener : NSObject <ButtonDelegate>

@end

#import "ButtonListener.h"

#import "Button.h"

@implementation ButtonListener

-(void)onclick:(Button *)button{

    NSLog(@"Button %@ 被点击",button);

}

@end

主函数：

//

//  main.m

//  Protocal

//

//  Created by WildCat on 13-7-24.

//  Copyright (c) 2013年 wildcat. All rights reserved.

//

#import <Foundation/Foundation.h>

#import "Button.h"

#import "ButtonListener.h"

int main(int argc, const char * argv[])

{

    @autoreleasepool {

        Button *button=[[[Button alloc] init] autorelease];

        Button *button2=[[[Button alloc] init] autorelease];

        ButtonListener *listener=[[[ButtonListener alloc] init] autorelease];

        button.delegate=listener;

        button2.delegate=listener;

        [button click];

        [button2 click];

    }

    return 0;

}

运行结果：

2013-07-24 16:49:41.344 Protocal[1380:303] 调用onclick方法

2013-07-24 16:49:41.346 Protocal[1380:303] Button <Button: 0x100109990>
被点击

2013-07-24 16:49:41.347 Protocal[1380:303] 调用onclick方法

2013-07-24 16:49:41.347 Protocal[1380:303] Button <Button: 0x1001099e0>
被点击