UIScrollView子视图中的UILabel上的UITapGestureRecognizer无法正常工作 [英] UITapGestureRecognizer on UILabels in subview of UIScrollView not working

问题描述

我有一个问题，我的UIScrollView的内容视图中的UILabel上的UITapGestureRecognizer没有调用它的方法.

I have a problem where my UITapGestureRecognizer on my UILabels in a content view in my UIScrollView is not calling it's methods.

视图层次结构如下:

• scrollView(UIScrollView)
  • contentView(UIView)
    • testLabel(UILabel)-这是连接UITapGestureRecognizer的地方
    • scrollView (UIScrollView)
      • contentView (UIView)
        • testLabel (UILabel) - here is where the UITapGestureRecognizer is attached

        我将代码简化为一个示例以突出问题所在

        I have distilled the code down to an example to highlight the problem

        // Set scrollview size - Added in Storyboad
        [scrollView setContentSize:CGSizeMake([arrayOfVerbs count]*self.view.frame.size.width, scrollView.contentSize.height)];
        [scrollView setCanCancelContentTouches:YES]; // Tried both yes and no
        [scrollView setPagingEnabled:YES];
        
        // Add content view
        UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height)];
        [scrollView addSubview:contentView];
        
        // Add test UILabel
        UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 100)];
        [testLabel setBackgroundColor:[UIColor redColor]];
        [testLabel setText:@"Test touch"];
        [testLabel setUserInteractionEnabled:YES];
        [contentView addSubview:testLabel];
        
        // Add gesture recogniser
        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(playSound:)];
        singleTap.numberOfTapsRequired = 1;
        [testLabel addGestureRecognizer:singleTap];
        

        这是轻击手势识别器应该调用的方法

        And this is the method that the tap gesture recogniser should call

        - (void)playSound:(UITapGestureRecognizer *)sender {
        
            NSLog(@"play sound");
        
            if(sender.state == UIGestureRecognizerStateEnded)
            {
                int pronounNumber = [sender.view tag];
                int exampleNumber = (int)sender.view.frame.origin.x%(int)self.view.frame.size.width;
        
                NSLog(@"Pronoun is %i and example is %i", pronounNumber, exampleNumber);
            }
        }
        

        当我尝试触摸UILabel时，永远不会调用此方法.

        This method is never called when I tried to touch on the UILabel.

        我尝试按照此

        I have tried setting the property canCancelContentTouches to both YES and NO on the scroll view as suggested by this thread, but it's still not working.

        奇怪的是，如果我在scrollView之外添加UILabel，则手势识别器将起作用！因此，问题仅出现在我的contentView(它是我的scrollView的子视图)中.

        The strange thing is, if I add a UILabel outside of the scrollView, then the gesture recogniser works! So the problem only occurs in my contentView which is a subview of my scrollView.

        我正在使用自动版式，如果有什么不同吗?

        I am using auto-layout, if that might be any difference?

        谢谢！

        推荐答案

        滚动视图还具有手势识别器.默认情况下，任何时候只能有1个手势识别器可以处理触摸.您需要使自己成为手势的委托，然后实现gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:以返回YES.这将使其能够与滚动视​​图同时工作.

        The scroll view also has a gesture recogniser. By default, only 1 gesture recognizer can be handling touches at any one time. You need to make yourself the delegate of your gesture and then implement gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: to return YES. This will allow it to work at the same time as the scroll view.

        这篇关于UIScrollView子视图中的UILabel上的UITapGestureRecognizer无法正常工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！