使用手势识别器：应该与手势识别器同时识别

Question

我正在尝试在我的应用上同时检测上下滑动。我有一个 SKScene，我在 func didMoveToView: view 添加手势识别器 我已经设置了委托：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可以正常工作。

但是当我尝试同时在两个方向上滑动时，不会触发相应的 func 并且不会触发 shouldRecognizeSimultaneouslyWithGestureRecognizer。

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

我猜你忘记设置委托了：

swipeUp.delegate = self
swipeDown.delegate = self