UIGestureRecognizer在UIScrollView减速期间未收到触摸

Question

I've been trying to create a UITextView subclass that handles swiping away the keyboard like in the Message.app.

I have a UIPanGestureRecognizer added to the keyWindow of my app, and the gesture delegate is configured for shouldRecognizeSimultaneouslyWithGestureRecognizer . Everything works fine except for when the UIScrollView is decelerating, during that phase it is possible to pan without the touches being registered.

You can take a look at a very simple github sample project here .

I have tried adding the UIPanGestureRecognizer directly to the viewController.view and to the scrollView, same issue occurs. I have also tried setting scrollView.panGestureRecognizer requireGestureRecognizerToFail: with my UITextView subclass gesture recognizer.

Any ideas as to why this may be happening?

Answer 1

除了创建新的UIPanGestureRecognizer ，您还可以在UIScrollView上使用它，然后通过- (void)addTarget:(id)target action:(SEL)action将自己的平移逻辑添加到该手势识别器中。