Object-c学习之路五（@protocol协议）

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