如何在NSNotification中發送對象？

-1

我想送對象選擇在NSNotification.I的意思是，我有3個按鈕和每個按鈕的點擊我註冊的通知，並在該事件發生我打電話一個選擇，並在選擇我要找出哪個按鈕用戶點擊了，因爲我對所有3個按鈕都有共同的操作。如何在NSNotification中發送對象？

-(void)allThreeButtonAction:(sender)id 
{ 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(performSomeOperationWhenEventOccur) name:@"EventCompletedNotification" object:nil]; 
}

//一些事件發生，所以我送通知

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

//通知的方法

-(void)performSomeOperationWhenEventOccur 
{ 
    //Here I want to know which button is pressed. 
}

我希望我很清楚。

來源

2012-06-06 Nuzhat Zari

你可能想看看postNotificationName:object:userInfo:從NSNotificationCenter documentation

您只需發送一個包含任何你需要確定按鈕的UserInfo（最簡單的就是指針按鈕），您在選擇取回。

你選擇的簽名應該收到通知：

- (void)performSomeOperationWhenEventOccur:(NSNotification*) notification:(NSNotification*) notification 
{ 
    // Use [notification userInfo] to determine which button was pressed... 
}

不要忘了修改選擇的名字，當你註冊它

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(performSomeOperationWhenEventOccur:) name:@"EventCompletedNotification" object:nil];

來源

2012-06-06 14:09:04

但如何我將在postNotificationName：object：userInfo中發送按鈕？我知道哪個按鈕只有當我註冊通知，在按鈕動作，即當我打電話時按下[[NSNotificationCenter defaultCenter] addObserver：self selector：@selector（performSomeOperationWhenEventOccur :) name：@「EventCompletedNotification 「object：nil] ;. –

-2

下面摘錄會幫助你。

Button1的

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(performSomeOperationWhenEventOccur:) name:@"button1" object:button1];

Button2的

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(performSomeOperationWhenEventOccur:) name:@"button2" object:button2];

到以下

- (void) performSomeOperationWhenEventOccur:(NSNotification *) notification 
{ 
    if ([[notification name] isEqualToString:@"button1"]) 
    { 
     NSButton *button1=[notification button1]; 
     NSLog (@"Successfully received the test notification! from button1"); 
    } 
    else 
    { 
     NSButton *button2=[notification button2]; 
     NSLog (@"Successfully received the test notification! from button2"); 
    } 
}

來源

2012-06-06 14:18:14

感謝您的回覆，但我希望按鈕實例不僅是哪個按鈕被點擊的信息。 –

如果你想通過按鈕對象，然後你爲什麼要傳遞對象：無通按鈕對象存在的nil.instead –

看到我更新的答案 –

更改方法，你可以不添加通知觀察者時傳遞一個對象，所以你必須要存儲的某處按下按鈕：

-(void)allThreeButtonAction:(id)sender 
{ 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(performSomeOperationWhenEventOccur) name:@"EventCompletedNotification" object:nil]; 
    self.buttonPressed = sender; 
}

然後，你可以看它在您的通知處理程序：

-(void)performSomeOperationWhenEventOccur 
{ 
    if (self.buttonPressed = self.button1) 
     ... 
}

來源

2012-06-06 14:25:09 Brian

如何在NSNotification中發送對象？

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