無法成功移除GestureRecognizer iOS

Question

我的iPad應用程序中有一個按鈕，當它按下addGestureRecognizer的按鈕時。當再次按下時，它應該刪除它們。

我的代碼在一個if塊中，我知道正確的代碼塊運行，因爲NSLog打印正確的日誌消息。

我加入了識別這樣的：

[self.view addGestureRecognizer:panRecognizer]; 
[self.view addGestureRecognizer:pinchRecognizer]; 
[self.view addGestureRecognizer:rotationRecognizer]; 
[self.view addGestureRecognizer:tapRecognizer]; 

，並試圖刪除它們像這樣：

[self.view removeGestureRecognizer:panRecognizer]; 
[self.view removeGestureRecognizer:pinchRecognizer]; 
[self.view removeGestureRecognizer:rotationRecognizer]; 
[self.view removeGestureRecognizer:tapRecognizer]; 

這是我的全部功能： http://www.pastelib.com/show/ZlICyb9Q

它不工作，我不知道爲什麼，你們有什麼建議嗎？提前

感謝所有幫助和建議:)

Answer 1

你GestureReconizers被局部聲明的-showMenu：方法。 因此，每次按下按鈕時，都會創建新的GestureReconizers，因此您未嘗試刪除先前的重構器，但嘗試刪除新創建的重構器。

更改重組對象的範圍，並解決您的問題。

乾杯。

編輯與代碼示例：

-(IBAction) showMenu:(id) sender {  
    if([self.view.subviews containsObject:menuView]) { 

     NSLog(@"remove gestures!"); 

     // Dismiss menu 
     [menuView removeFromSuperview]; 

     // Remove gestures 
     [self.view removeGestureRecognizer:panRecognizer]; 
     [self.view removeGestureRecognizer:pinchRecognizer]; 
     [self.view removeGestureRecognizer:rotationRecognizer]; 
     [self.view removeGestureRecognizer:tapRecognizer];   
    }else{ 
     // Create menu   
     NSLog(@"add gestures!"); 

    panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)]; 

    pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchDetected:)]; 

    rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationDetected:)]; 

    tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected:)]; 

    tapRecognizer.numberOfTapsRequired = 2;  

    // Make gestures work simultaneously 
    panRecognizer.delegate = self; 
    pinchRecognizer.delegate = self; 
    rotationRecognizer.delegate = self; 

     // Set width and height if empty   
     self.menuController = [[menuController alloc] initWithNibName:@"menuController" bundle:nil]; 

     if(screenWidth == 0) { 

      UIInterfaceOrientation currentOrientation = [[UIApplication sharedApplication] statusBarOrientation]; 

      if(currentOrientation == 1 || currentOrientation == 2) { 
       // portrait 
       screenHeight = self.menuController.view.frame.size.height; 
       screenWidth  = self.menuController.view.frame.size.width; 
      }else{ 
       // Landscape 
       screenHeight  = self.menuController.view.frame.size.width; 
       screenWidth = self.menuController.view.frame.size.height+20; //height+20px for the status bar 
      } 
     } 

     int menuHeight = 80; 
     self.menuController.view.frame = CGRectMake(0,screenHeight-(menuHeight-20), screenWidth, menuHeight); 

     self.menuView = self.menuController.view; 

     [self.menuController setDelegate:self]; 

     [self addChildViewController:self.menuController]; 
     [self.menuController didMoveToParentViewController:self]; 
     [self.view addSubview:menuView]; 


     // Add image gestures 
     [self.view addGestureRecognizer:panRecognizer]; 
     [self.view addGestureRecognizer:pinchRecognizer]; 
     [self.view addGestureRecognizer:rotationRecognizer]; 
     [self.view addGestureRecognizer:tapRecognizer]; 

     [self.view bringSubviewToFront:menuButton];   

    } 
} 

Answer 2

我這樣做在我的項目和它的工作：

while (cellMainView.descripcionArticulo.gestureRecognizers.count) { 
    [cellMainView.descripcionArticulo removeGestureRecognizer:[cellMainView.descripcionArticulo.gestureRecognizers objectAtIndex:0]]; 
}