iOS:识别捏手势而不是两个手指平移？

Question

目标是仅在未进行双指平移时才识别捏合手势。

此代码允许 pinchGesture 和双指 panGestures，但它们同时发生。这是基于 this answer使用 gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) 函数。

    // Handle two-finger pans
    let twoFingerPanRecognizer = UIPanGestureRecognizer(target: self, action: #selector(sceneViewPannedTwoFingers))
    twoFingerPanRecognizer.minimumNumberOfTouches = 2
    twoFingerPanRecognizer.maximumNumberOfTouches = 2
    twoFingerPanRecognizer.delegate = self
    sceneView.addGestureRecognizer(twoFingerPanRecognizer)

    // Handle pinches
    let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(sceneViewPinched))
    pinchGesture.delegate = self
    sceneView.addGestureRecognizer(pinchGesture)

    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) -> Bool {
       if gestureRecognizer is UIPinchGestureRecognizer {
          return false
       } else {
          return true
       }
     }

此代码允许双指平移，但合拢根本不起作用。

    // Handle two-finger pans
    let twoFingerPanRecognizer = UIPanGestureRecognizer(target: self, action: #selector(sceneViewPannedTwoFingers))
    twoFingerPanRecognizer.minimumNumberOfTouches = 2
    twoFingerPanRecognizer.maximumNumberOfTouches = 2
    twoFingerPanRecognizer.delegate = self
    sceneView.addGestureRecognizer(twoFingerPanRecognizer)

    // Handle taps
    let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(sceneViewTapped))
    sceneView.addGestureRecognizer(tapRecognizer)

    // Handle pinches
    let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(sceneViewPinched))
    pinchGesture.delegate = self
    pinchGesture.requireGestureRecognizerToFail(twoFingerPanRecognizer)
    sceneView.addGestureRecognizer(pinchGesture)

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

Answer 1

你试过这样吗

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    if ((gestureRecognizer is UIPinchGestureRecognizer || gestureRecognizer is UIPanGestureRecognizer)
         && (otherGestureRecognizer is UIPinchGestureRecognizer || otherGestureRecognizer is UIPanGestureRecognizer))  {
        return false
    }
    return true
}