如果滑动，Swift 不会触发 touchesBegan答案

【问题标题】：Swift not firing touchesBegan if swipe如果滑动，Swift 不会触发 touchesBegan
【发布时间】：2015-08-04 02:44:14
【问题描述】：

您好，我有一个 swift 应用程序，每次触摸都开始调用一个函数，但是如果用户正在滑动，我不希望 touchesBegan 被调用。我怎样才能避免这种情况？

开始接触：

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
//function call
}

滑动：

var Swipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
    Swipe.direction = .Up
    //Swipe.cancelsTouchesInView = true        did not make a difference
    view.addGestureRecognizer(Swipe)

我也不想做触摸结束，因为这增加了我无法拥有的延迟

【问题讨论】：

标签： swift touchesbegan

【解决方案1】：

使您的 UIViewController 的视图成为一个自定义类并在那里处理这些触摸 - 它们应该按照您尝试的方式接收，但只能在 UIView 类本身中。

【讨论】：

【解决方案2】：

如果您想将滑动与触摸分开，您可以使用 delaysTouchesBegan 方法轻松完成，例如：

        let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedRight:"))
        swipeRight.direction = .Right
        swipeRight.cancelsTouchesInView = true
        swipeRight.delaysTouchesBegan = true
        view.addGestureRecognizer(swipeRight)


        let swipeLeft:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedLeft:"))
        swipeLeft.direction = .Left
        swipeLeft.cancelsTouchesInView = true
        swipeLeft.delaysTouchesBegan = true
        view.addGestureRecognizer(swipeLeft)


        let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedUp:"))
        swipeUp.direction = .Up
        swipeUp.cancelsTouchesInView = true
        swipeUp.delaysTouchesBegan = true
        view.addGestureRecognizer(swipeUp)


        let swipeDown:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector("swipedDown:"))
        swipeDown.direction = .Down
        swipeDown.cancelsTouchesInView = true
        swipeDown.delaysTouchesBegan = true
        view.addGestureRecognizer(swipeDown)

在您的 viewDidLoad 或 didMoveToView 中（如果您在 spritekit 场景中）

并分别制作方法：

func swipedRight(sender:UISwipeGestureRecognizer){
   print("swiped right")
}

func swipedLeft(sender:UISwipeGestureRecognizer){
   print("swiped left")
}

func swipedUp(sender:UISwipeGestureRecognizer){
   print("swiped up")
}

func swipedDown(sender:UISwipeGestureRecognizer){
   print("swiped down")
}

然后您可以使用官方委托方法来控制您的触摸，例如：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
...// handle your touches..
}

【讨论】：