在 UIScrollView 中允许单击手势识别器和双击

Question

所以我在 UIScrollView 中有一个 UIImageView，我需要捕获两者： - 单击手势 - 双击手势对于 UIImageView

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

到目前为止，如果我将单击手势识别器添加到滚动视图，则单击会立即被识别，而不会识别双击。

如果我将单击手势识别器添加到图像视图，它不会收到任何动作，但双击可以工作

欢迎任何建议，谢谢..

Answer 1

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

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

两者都添加到同一个图像视图中，要实现您想要的效果，只需添加以下行。

[tapRecognizerForSingleTap requireGestureRecognizerToFail:tapRecognizerForDoubleTap];

上面这行你要求的是单击，只有当它不是双击时才会被识别。

Answer 2

试试这个代码，

Objective - 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 3

最上面的答案居然把最后一行倒过来了。正确的代码应该是：

[singleTap requireGestureRecognizerToFail:doubleTap];

在 UIScrollView 中允许单击手势识别器和双击

Allow both single tap gesture recognizer and double tap in UIScrollView

objective-c

uiscrollview

ios