iOS: recognize pinch gestures but not two finger pans?

Question

The goal is to only let pinch gestures get recognized if a two-finger pan is not in process.

This code allows both pinchGesture and two-finger panGestures, but they occur at the same time. This was based off this answer to use the gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) function.

    // 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
       }
     }

This code allows two-finger pans, but pinches do not work at all.

    // 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

Have you try like this

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
}