UITapGestureRecognizer 莫名其妙地停止识别点击手势

Question

尽可能简单地说，我分配给UIImageView 的UITapGestureRecognizer 将不可避免地莫名其妙地停止触发它所指向的方法。

它甚至更奇怪，因为有时它仅在一次点击后就无法识别手势，而其他时候则需要数十次点击。但是，每次都不会失败，它不可避免地会停止。

我尝试将点击手势设置为强关联属性，但没有效果。

我最近尝试过的（没有成功）是，在手势的选择器方法运行正常后，我删除了手势，然后重新分配并重新初始化了一个新的UITapGestureRecognizer，但没有任何效果。这让我相信问题出在UIImageView 而不是UITapGuestureRecognizer - 但话虽如此，我不知道。

但是，我将 UIImageView 放入了几个 UIView 动画中，所以也许这与它有关？

另外，UIImageView 已启用用户交互，我从未禁用它。

有什么建议吗？如果有帮助，我很乐意发布代码。这是一些代码：

设置 UIImageView（图像视图和点击手势都已设置为属性，以便我可以将它们强烈关联）：

self.cardImageView = [[UIImageView alloc] initWithFrame:frame];
[self.cardImageView setContentMode:UIViewContentModeScaleAspectFill];
[self.cardImageView setClipsToBounds:TRUE];
[self.cardImageView setBackgroundColor:[UIColor nearBlack]];
[self.cardImageView.layer setBorderColor:[[UIColor fiftyGray]CGColor]];
[self.cardImageView.layer setBorderWidth:1.0];
[self.cardImageView setUserInteractionEnabled:TRUE];

self.imageFullScreenTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapImageView)];
[self.cardImageView addGestureRecognizer:self.imageFullScreenTap];

[view addSubview:self.cardImageView];

动画：

[UIView animateWithDuration:0.2 animations:^
     {
         [self.cardImageView setFrame:[self frameForImageView]];

         [page setAlpha:!fullscreenTemplate];
         [saveExitButton setAlpha:!fullscreenTemplate];
         [optionsButton setAlpha:!fullscreenTemplate];

         if(fullscreenTemplate)
         {
             [self.cardImageView.layer setBorderColor:[UIColor clearColor].CGColor];
             [self.view setBackgroundColor:[UIColor blackColor]];
         }
         else
         {
             [self.cardImageView.layer setBorderColor:[UIColor fiftyGray].CGColor];
             [self.view setBackgroundColor:[UIColor clearColor]];
         }
     }
     completion:^(BOOL finished)
     {
         [scroller setScrollEnabled:!fullscreenTemplate];

         if (self.imageFullScreenTap)
         {
             [self.cardImageView removeGestureRecognizer:self.imageFullScreenTap];
             self.imageFullScreenTap = nil;
         }

         self.imageFullScreenTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapImageView)];
         [self.cardImageView addGestureRecognizer:self.imageFullScreenTap];
     }];

Answer 1

[UIView transitionWithView:self.cardImageView
                  duration:0.2f 
                   options:UIViewAnimationOptionAllowUserInteraction |
                        UIViewAnimationOptionLayoutSubviews
                animations:^(void) {
                    [self.cardImageView setFrame:[self frameForImageView]];
                    [page setAlpha:!fullscreenTemplate];
                    [saveExitButton setAlpha:!fullscreenTemplate];
                    [optionsButton setAlpha:!fullscreenTemplate];
                    if(fullscreenTemplate) {
                        [self.cardImageView.layer setBorderColor:[UIColor clearColor].CGColor];
                        [self.view setBackgroundColor:[UIColor blackColor]];
                    } else {
                        [self.cardImageView.layer setBorderColor:[UIColor fiftyGray].CGColor];
                        [self.view setBackgroundColor:[UIColor clearColor]];
                    }
                } completion:^(BOOL finished) {
                    [scroller setScrollEnabled:!fullscreenTemplate];
                }]; 

以上代码已将animateWithDuration:completion: 方法更改为transitionWithView:duration:options:animations:completion: 方法。 这里重要的关键字是UIViewAnimationOptionAllowUserInteraction。这将允许在图像制作动画时进行 userInteraction。

如果一段时间后 TapGesture 仍然无法识别，请告诉我你的 tapImageView 方法的代码。

Answer 2

使用UIViewAnimationOptionAllowUserInteraction 和bringSubviewToFront

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

动画：

[UIView animateWithDuration:0.2
                          delay:0.0         
                        options:UIViewAnimationOptionAllowUserInteraction
                     animations:^
                             {
                                [self.cardImageView setFrame:[self frameForImageView]];

                                [page setAlpha:!fullscreenTemplate];
                                [saveExitButton setAlpha:!fullscreenTemplate];
                                [optionsButton setAlpha:!fullscreenTemplate];

                                if(fullscreenTemplate)
                                {
                                  [self.cardImageView.layer setBorderColor:[UIColor clearColor].CGColor];
                                  [self.view setBackgroundColor:[UIColor blackColor]];
                                }
                                else
                                {
                                  [self.cardImageView.layer setBorderColor:[UIColor fiftyGray].CGColor];
                                  [self.view setBackgroundColor:[UIColor clearColor]];
                                }
                             }
                             completion:^(BOOL finished)
                             {
                               [scroller setScrollEnabled:!fullscreenTemplate];

                               if (self.imageFullScreenTap)
                               {
                                 [self.cardImageView removeGestureRecognizer:self.imageFullScreenTap];
                                 self.imageFullScreenTap = nil;
                                } 

                                self.imageFullScreenTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapImageView)];
                                [self.cardImageView addGestureRecognizer:self.imageFullScreenTap];
                             }];  

Answer 3

如果您在某个时候将图像视图添加到 uiscrollview，那么恐怕大多数时候手势识别器都无法工作。或者你尝试在父视图上启用用户交互。