ios - 在 UIGestureRecognizer 中双击

Question

我的项目有一个自定义的 uitableviewCell，里面有一个图像 slider 。基本上是带有分页图像的 ScrollView 。

我需要点击并双击此 ImageSlider 来执行一些操作。单击可以正常工作，但不会触发双击选择器。

override func awakeFromNib() {
    super.awakeFromNib()

    let singleTap = UITapGestureRecognizer(target: self, action: #selector(singleTap(_:)))
    singleTap.numberOfTapsRequired = 1
    singleTap.cancelsTouchesInView = false
    slideShowView.addGestureRecognizer(singleTap)


    //Double tap recognizer
    let doubleTap = UITapGestureRecognizer(target: self, action: #selector(doubleTap(_:)))
    doubleTap.cancelsTouchesInView = false
    doubleTap.numberOfTapsRequired = 2

    slideShowView.addGestureRecognizer(doubleTap)

    singleTap.require(toFail: doubleTap)

    print("slideshow recognizers",slideShowView.gestureRecognizers!) }         


func doubleTap(_ sender : UITapGestureRecognizer) {

     print("doubletap")        
}

 func singleTap(_ sender : UITapGestureRecognizer) {

     print("singleTap")
}

问候

编辑:你可以在这里看到我的日志，我也更改了我原来的帖子

 slideshow recognizers [<UITapGestureRecognizer: 0x17ec1670; state = Possible; view = <ImageSlideshow.ImageSlideshow 0x17ec0e30>; target= <(action=singleTap:, target=<Descubra.FeedDefaultCell 0x183cf800>)>; must-fail = {
    <UITapGestureRecognizer: 0x17e763b0; state = Possible; view = <ImageSlideshow.ImageSlideshow 0x17ec0e30>; target= <(action=doubleTap:, target=<Descubra.FeedDefaultCell 0x183cf800>)>; numberOfTapsRequired = 2>
}>, <UITapGestureRecognizer: 0x17e763b0; state = Possible; view = <ImageSlideshow.ImageSlideshow 0x17ec0e30>; target= <(action=doubleTap:, target=<Descubra.FeedDefaultCell 0x183cf800>)>; numberOfTapsRequired = 2; must-fail-for = {
    <UITapGestureRecognizer: 0x17ec1670; state = Possible; view = <ImageSlideshow.ImageSlideshow 0x17ec0e30>; target= <(action=singleTap:, target=<Descubra.FeedDefaultCell 0x183cf800>)>>
}>]

singleTap

Answer 1

为了使单击和双击手势协同工作，系统在看到单个手势时需要知道它是真正的单击手势还是双击手势的前半部分。它要么必须了解 future (这将是一个非常有值(value)的功能)，要么必须等待，看看接下来会发生什么。告诉它等等看...

singleTap.requireGestureRecognizerToFail(doubleTap)