Swift - How to remove swipe gesture from scene when moving to another one?

问题

So my game uses swipe gestures, in my didMoveToView() function I have these gestures initialized:

            let swipeRight = UISwipeGestureRecognizer()
            swipeRight.direction = UISwipeGestureRecognizerDirection.Right
            self.view?.addGestureRecognizer(swipeRight)

            let swipeLeft = UISwipeGestureRecognizer()
            swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
            self.view?.addGestureRecognizer(swipeLeft)

            let swipeUp = UISwipeGestureRecognizer()
            swipeUp.direction = UISwipeGestureRecognizerDirection.Up
            self.view?.addGestureRecognizer(swipeUp)

            let swipeDown = UISwipeGestureRecognizer()
            swipeDown.direction = UISwipeGestureRecognizerDirection.Down
            self.view?.addGestureRecognizer(swipeDown)

Problem is when I move to my GameOver scene, and I swipe, it crashes my app. I noticed someone had posted something similar and got this as an answer

override func willMoveFromView(view: SKView) {
   for recognizer in self.view.gestureRecognizers! {
       self.view.removeGestureRecognizer(recognizer)
   }
}

Still not quite sure how to implement this and/or remove the gestures from the scene before switching to game over. Can anyone help?

回答1:

The following removes all swipe gesture recognizers from the view:

override func willMoveFromView(view: SKView) {
    if let gestures = view.gestureRecognizers {
        for gesture in gestures {
           if let recognizer = gesture as? UISwipeGestureRecognizer {
                view.removeGestureRecognizer(recognizer)
           }
        }
    }
}

回答2:

You are removing all kind of gesture, try this:

if([recognizer isKindOfClass:[UISwipeGestureRecognizer class]]) {
    [self removeGestureRecognizer:recognizer];
}

Hope this helps.. :)

回答3:

Replace UIGestureRecognizer with UISwipeGestureRecognizer if that's what you want to remove.

extension SKView {
    func removeAllGestureRecognizers() {
        if let objects = gestureRecognizers {
            for object in objects {
                if let gestureRecognizer = object as? UIGestureRecognizer {
                    removeGestureRecognizer(gestureRecognizer)
                }
            }
        }
    }
}

来源：https://stackoverflow.com/questions/27883575/swift-how-to-remove-swipe-gesture-from-scene-when-moving-to-another-one

标签

ios

swift

sprite-kit

uigesturerecognizer