Question

我正在使用spriteKit。我不知道这是否重要。我在didMove（toView）中初始化了两个UIGestureRecognizer到我的视图：

let longPress = UILongPressGestureRecognizer()
longPress.minimumPressDuration = CFTimeInterval(0.0)
longPress.addTarget(self, action: #selector(self.longPressGesture(longpressGest:)))
self.view?.addGestureRecognizer(longPress)

let swipeUp = UISwipeGestureRecognizer()
swipeUp.direction = UISwipeGestureRecognizerDirection.up
swipeUp.addTarget(self, action: #selector(self.swipeUpGesture(swipe:)))
self.view?.addGestureRecognizer(swipeUp)

我的问题是只调用了第一个gestureRecognizer（longpressGest）。当我删除第一个GestureRecognizer时，swipeGestureRecognizer确实有效。我该如何解决这个问题？

Answer 1

您需要将游戏场景视图设为手势识别器的代表。您还需要实现其方法shouldRecognizeSimultaneouslyWith，如圣诞节提到的那样：

因此，在您的游戏场景声明中，只需添加UIGestureRecognizerDelegate：

class GameScene: SKScene, SKPhysicsContactDelegate, UIGestureRecognizerDelegate {

在你的didMove（查看：SKView）方法中设置其委托：

let longPress = UILongPressGestureRecognizer()
longPress.delegate = self
longPress.minimumPressDuration = 0
longPress.addTarget(self, action: #selector(longPressGesture))
view.addGestureRecognizer(longPress)

let swipeUp = UISwipeGestureRecognizer()
swipeUp.delegate = self
swipeUp.direction = .up
swipeUp.addTarget(self, action: #selector(swipeUpGesture))
view.addGestureRecognizer(swipeUp)

同样在Swift 4中，您需要将@objc添加到您的方法

@objc func longPressGesture(_ longPress: UILongPressGestureRecognizer) {
    print("longPressGesture")
}

@objc func swipeUpGesture(_ swipeUp: UISwipeGestureRecognizer) {
    print("swipeUpGesture")
}

不要忘记添加方法shouldRecognizeSimultaneouslyWith，正如xmasRights已经提到的那样：

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    print("shouldRecognizeSimultaneouslyWith")
    return true
}

Answer 2

您还可以使用相同的手势识别器，并在此功能的两个手势之间进行区别

Answer 3

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool 
{
    return true
}

https://developer.apple.com/documentation/uikit/touches_presses_and_gestures/coordinating_multiple_gesture_recognizers/allowing_the_simultaneous_recognition_of_multiple_gestures

一个视图上有两个UIGestureRecognizer？

3 个答案: