iOS 代理－协议的代码笔记

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1，谁要让别人给自己做事（协议方法里面获得值）则他必须要加上这么一个代理

@interface ViewController :UIViewController<TestDelegate,DoSomeDelegate,DoSomeDataSource>

实现代理方法等待代理传过来的数值

-(void)changeValue:(NSString *)value;

2，给别人做事他必须有一个代理的对象

@property(strong,nonatomic)id<DoSomeDelegate>delegate;

3.给别人做什么事情呢？如下：

[self.delegatechangeValue:self.text.text];//要做的事情就是：赋值

4 源代码：

代理类：

////  DoSomeObj.h//  delegate////  Created by linpeng on 14-2-25.//  Copyright (c) 2014年 linpeng. All rights reserved.//#import <Foundation/Foundation.h>//添加协议@protocol  DoSomeDelegate, DoSomeDataSource;@interface DoSomeObj : NSObject@property(strong,nonatomic)NSString *str1,*str2;@property(strong,nonatomic)id<DoSomeDelegate>delegate;@property(strong,nonatomic)id<DoSomeDataSource>datasource;-(void)Action;@end//定义一个协议 ：DoSomeDelegate@protocol DoSomeDelegate <NSObject>@required-(void)doSomeDelegateAction:(NSString *)str;@end//定义一个协议 ：DoSomeDataSource@protocol DoSomeDataSource <NSObject>@required-(void)doSomeDataSourceAction:(NSString *)str;@end

////  DoSomeObj.m//  delegate////  Created by linpeng on 14-2-25.//  Copyright (c) 2014年 linpeng. All rights reserved.//#import "DoSomeObj.h"@implementation DoSomeObj-(id)init{    if(self=[super init])    {        self.str1 = @"delegate";        self.str2 = @"datasource";        //放着里是没用的   因为这个时候的代理＝＝＝是空的！！！！//        [self.delegate doSomeDelegateAction:@"delegate"];//        [self.datasource  doSomeDataSourceAction:@"datasource"];    }    return  self;}//促发代理做一些处理-(void)Action{    //前面 DoSomeObj *doSome = [[DoSomeObj alloc] init];doSome.delegate = self;  所以他的代理不是空的    [self.delegate doSomeDelegateAction:self.str1];    [self.datasource  doSomeDataSourceAction:self.str2];}@end

使用代理

#import <UIKit/UIKit.h>#import "TestDelegate.h"#import "DoSomeObj.h"@interface ViewController : UIViewController<TestDelegate,DoSomeDelegate,DoSomeDataSource>@end

 //第二个代理    DoSomeObj *doSome = [[DoSomeObj alloc] init];    doSome.delegate = self;    doSome.datasource = self;

//触发代理类赋值    [doSome Action];

#pragma 协议方法-(void)doSomeDataSourceAction:(NSString *)str{    lab.text = [NSString stringWithFormat:@"%@--%@",lab.text,str];}#pragma 协议方法-(void)doSomeDelegateAction:(NSString *)str{    lab.text = [NSString stringWithFormat:@"%@--%@",lab.text,str];    }

download:demo

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