ios - 使用 gestureRecognizer : shouldRecognizeSimultaneouslyWithGestureRecognizer

Question

我正在尝试在我的应用程序上同时检测向上和向下滑动。我有一个 SKScene，我在 func didMoveToView: view 中添加了手势识别器我已设置委托(delegate):UIGestureRecognizerDelegate，并让以下函数全部返回 true。

gestureRecognizerShouldBegin: gestureRecognizer
gestureRecognizer: shouldRecognizeSimultaneouslyWithGestureRecognizer
gestureRecognizer: shouldReceiveTouch

当我用一根手指滑动时，我可以看到 shouldRecognizeSimultaneouslyWithGestureRecognizer 被触发并返回 true。附加到滑动的功能也有效。

但是当我尝试同时向两个方向滑动时，相应的功能不会被触发，shouldRecognizeSimultaneouslyWithGestureRecognizer 也不会被触发。

当我单独执行滑动时，滑动效果很好，但同时没有执行滑动时。

我在这里做错了什么？

编辑:

class GameControlller: SKScene, SKPhysicsContactDelegate, UIGestureRecognizerDelegate {}

添加滑动:

 override func didMoveToView(view: SKView) {
    print("did move to view")
    let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(GameControlller.PaddleMoveUp(_:)))
    swipeDown.direction = .Down
    self.view!.addGestureRecognizer(swipeDown)

    let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(GameControlller.PaddleMoveDown(_:)))
    swipeUp.direction = .Up
    self.view!.addGestureRecognizer(swipeUp)
    swipeDown.delegate = self
    swipeUp.delegate = self
}

UIGestureRecognizer 委托(delegate)函数:

func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}


 func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    print("Simultaneous gesture recognizer!")
    return true
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
    return true
}

Answer 1

我猜你忘了设置委托(delegate):

swipeUp.delegate = self
swipeDown.delegate = self