在UIScrollView中允许单点击手势识别器和双击

Question

所以我有一个UIImageView在一个UIScrollView中，我需要同时捕获两个：-单点击手势- UIImageView的双点击手势

双点击手势应该作为缩放动作发送到UIScrollView，单个点击手势被我自己创建的UITapGestureRecognizer捕获。双点击手势比单个点击具有更高的优先级(当有双点击时，放大滚动视图，否则执行单个点击)

到目前为止，如果我将单点击手势识别器添加到滚动视图中，则可以立即识别单个抽头，并且无法识别双抽头。

如果我将单个点击手势识别器添加到图像视图中，它就不会收到任何操作，但是双点击工作。

任何建议都很感谢，谢谢..

Answer 1

试试这段代码，

目标- C

 UITapGestureRecognizer *singletap = [[UITapGestureRecognizer alloc]
                                                     initWithTarget:self
                                                     action:@selector(singleTap:)];
    singletap.numberOfTapsRequired = 1;
    singletap.numberOfTouchesRequired = 1;

[scrollView addGestureRecognizer:singletap];


UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                                 initWithTarget:self
                                                 action:@selector(doubleTap:)];
doubleTap.numberOfTapsRequired =2 ;
doubleTap.numberOfTouchesRequired = 1;

[scrollView addGestureRecognizer:doubleTap];



[singleTap requireGestureRecognizerToFail:doubleTap];

Swift 3.0

var singletap = UITapGestureRecognizer(target: self, action: #selector(self.singleTap))
singletap.numberOfTapsRequired = 1
singletap.numberOfTouchesRequired = 1
scrollView.addGestureRecognizer(singletap)
var doubleTap = UITapGestureRecognizer(target: self, action: #selector(self.doubleTap))
doubleTap.numberOfTapsRequired = 2
doubleTap.numberOfTouchesRequired = 1
scrollView.addGestureRecognizer(doubleTap)
singleTap.require(toFail: doubleTap)

Answer 2

UITapGestureRecognizer *tapRecognizerForSingleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapAction:)];
[tapRecognizerForSingleTap setNumberOfTapsRequired:1];

UITapGestureRecognizer *tapRecognizerForDoubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapAction:)];
[tapRecognizerForDoubleTap setNumberOfTapsRequired:2];

两者都添加在一个相同的图像视图中，要实现您想要的，只需添加以下一行即可。

[tapRecognizerForSingleTap requireGestureRecognizerToFail:tapRecognizerForDoubleTap];

通过上面的行，你要求的单一水龙头，只有当它不是双龙头时才会被识别。