NSNotificationCenter 的使用

 

1. 定義一個方法

-(void) update{       } 

 

2. 對象註冊，並關連消息

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(update) name:@"update" object:nil]

 

3. 在要發出通知消息的地方

[[NSNotificationCenter defaultCenter] postNotificationName:@"update" object:nil];

 

詳細介紹請參考 Notifications

http://blog.sina.com.cn/s/blog_5df7dcaf0100c0q2.html

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 用代碼說話

- (id)init...{

    [[NSNotificationCenter defaultCenter] addObserver:self  
                                             selector:@selector(selector1:)
                                                 name:@"MY_SELECTOR_1"
                                               ojbect:nil];
} 

- (void)selector1:(NSNotification *)notification{

    NSObject *obj  = [notifaction object];
    if([obj isKindOfClass: [NSDictionary class]]){

        // Do dictionary payload funcntion 

    }else{

        //perform non-object payload function

    }
}

- (void)myNotifier{

    [[NSNotificationCenter defaultCenter] postNotificationName:@"MY_SELECTOR_1"];

    NSDictionary *myDictionary = [NSDictionary dictionaryWithContentOfFile:@"myFile.plist"];
    [[NSNOtificationCenter defaultCenter] postNotificationName:@"My_SELECTOR_1" object:myDictionary];
}

- (void)dealloc{

    [super defalloc];

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:@"MY_SELECTOR_1"
                                                  object:nil];
}

 

原文地址：http://blog.csdn.net/flyhawk007j2me/article/details/5924799