以編程方式創建的UIImageView上未觸發的UITapGestureRecognizer

我正在使用XCode 4.5.1。以編程方式創建的UIImageView上未觸發的UITapGestureRecognizer

我的.h文件和.m文件開始在viewDidLoad添加<UIGestureRecognizerDelegate>

@interface FirstViewController() 

@property (nonatomic, strong) UIImageView *img1; 

@end

然後，創建UIImageView編程像

self.img1 = [[UIImageView alloc] initWithFrame:CGRectMake(50, -30, 44, 44)]; 
[self.img1 setImage:[UIImage imageNamed:@"image1.png"]]; 
[self.img1 setAlpha:0.8]; 
[self.img1 setHidden:NO]; 
[self.img1 setUserInteractionEnabled:YES]; 
[self.img1 setTag:901];

然後

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(guessTapObject:)]; 
tap.numberOfTapsRequired = 1; 
tap.numberOfTouchesRequired = 1; 
tap.delegate = self; 

[self.img1 addGestureRecognizer:tap]; 

[self.view addSubview:self.img1]; 
[self.view bringSubviewToFront:self.img1];

並在末尾

- (void)guessTapObject:(UITapGestureRecognizer *) gesture 
{ 
    // guessing the image 
    UIImageView *tapImageView = (UIImageView*) gesture.view; 
    NSLog(@"Gesture Tag: %d", tapImageView.tag); 
}

我有4個不同的圖像，並以編程方式創建它們，如上所述。並應用動畫從上到下移動它們。

我希望當用戶點擊圖像，它應該動畫和消失（我知道代碼）。但代碼不會觸發輕擊事件。我把斷點放在guessTapObject函數的開頭，但不要去那裏。

在UITapGestureRecognizer聲明中，調試顯示guessTapObject已附加到識別器以執行輕擊操作。

請幫助爲什麼龍頭事件不會觸發其選擇器的方法？

感謝您的幫助提前。

編輯：我也試圖與for循環中分別具有手勢識別每一個ImageView的

for (UIView * view in self.view.subviews) { 
    if (view.tag > 900){ 
     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(guessTapObject:)]; 
     tap.numberOfTapsRequired = 1; 
     tap.numberOfTouchesRequired = 1; 
    // tap.delegate = self; 
     [view addGestureRecognizer:tap]; 
     NSLog(@"tapView: %@", tap.view); 
     NSLog(@"tap: %i", tap.enabled); 
    } 
}

來源

2013-04-23 eagle

我試過你發佈的代碼，它對我來說工作正常。我正在回調。如果您使用多個圖像，則需要創建不同的UITapGestureRecognizer。對於一張圖片，代碼應該可以正常工作，請檢查是否有任何東西是零，或者你的代碼沒有被調用。 – Amit 2013-04-23 10:02:23

這是行之有效的，確保在你將它設置爲-30時檢查你正在點擊的圖像，檢查一下。 – 2013-04-23 10:05:05

@ amit3117 ....我嘗試使用for循環，爲每個圖像添加單獨的gesturerecognizer，但在我的結尾不起作用。 – eagle 2013-04-23 10:15:01

我通過在視圖上應用手勢解決問題，而不是分別爲每個圖像視圖解決。

[self.view addGestureRecognizer:tap];

，然後在處理器/選擇器guessTapObject功能，我用這個

CGPoint tapLocation = [gesture locationInView:self.view]; // gives the tap coordinates 
for (UIView * view in self.view.subviews) { // gives view by iterating on each subview 
    CGRect dropRect = [[[view layer] presentationLayer] frame]; // specific way of getting the frame with respect to its layer 

    if(CGRectContainsPoint(dropRect, tapLocation)){ // checks for tap in the boundaries of view frame 
     if (view.tag > 900) // my specific view 
      // done what i want to do with that specific one 
      // as i removed it from my superview 
     } 
    } 
}

來源

2013-04-23 11:53:20 eagle

入住這
添加以下代碼到您的視圖控制器

In viewCo ntroller.h文件

@property (nonatomic, strong) UIImageView *img1; 
@property (nonatomic, strong) UIImageView *img2; 
@property (nonatomic, strong) UIImageView *img3;

在viewController.m文件
裏面viewDidLoad方法

// Init Image 1 
self.img1 = [[UIImageView alloc] initWithFrame:CGRectMake(50, 30, 44, 44)]; 
[self.img1 setImage:[UIImage imageNamed:@"image1_name.jpg"]]; 
[self.img1 setAlpha:0.8]; 
[self.img1 setHidden:NO]; 
[self.img1 setUserInteractionEnabled:YES]; 
[self.img1 setTag:901]; 

// Init Image 2 
self.img2 = [[UIImageView alloc] initWithFrame:CGRectMake(100, 30, 44, 44)]; 
[self.img2 setImage:[UIImage imageNamed:@"image2_name.jpg"]]; 
[self.img2 setAlpha:0.8]; 
[self.img2 setHidden:NO]; 
[self.img2 setUserInteractionEnabled:YES]; 
[self.img2 setTag:902]; 

// Init Image 3 
self.img3 = [[UIImageView alloc] initWithFrame:CGRectMake(50, 130, 44, 44)]; 
[self.img3 setImage:[UIImage imageNamed:@"image3_name.jpg"]]; 
[self.img3 setAlpha:0.8]; 
[self.img3 setHidden:NO]; 
[self.img3 setUserInteractionEnabled:YES]; 
[self.img3 setTag:903]; 

// Add Images to view 
[self.view addSubview:self.img1]; 
[self.view bringSubviewToFront:self.img1]; 

[self.view addSubview:self.img2]; 
[self.view bringSubviewToFront:self.img2]; 

[self.view addSubview:self.img3]; 
[self.view bringSubviewToFront:self.img3]; 

// Set Tap Gesture to each image of view 
for (UIView * view in self.view.subviews) { 
    if (view.tag > 900){ 
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] 
             initWithTarget:self 
             action:@selector(guessTapObject:)]; 
    tap.numberOfTapsRequired = 1; 
    tap.numberOfTouchesRequired = 1; 
    [view addGestureRecognizer:tap]; 
    NSLog(@"tapView: %@", tap.view); 
    NSLog(@"tap: %i", tap.enabled); 
    } 
}

確保圖像應爲前循環添加（使用子視圖陣列添加TapGesture）

來源

2013-04-23 11:10:48

我被卡在類似的問題..確保ImageView的設置爲用戶交互真..

imageView.userInteractionEnabled = YES;

它爲我工作！

來源

2013-10-28 05:46:58

以編程方式創建的UIImageView上未觸發的UITapGestureRecognizer

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