Open Radar

 
Summary:
Any subclass of a UIPanGestureRecognizer that calls -[UIPanGestureRecognizer ignoreTouch:forEvent:] makes the recognizer be stuck in an inconsistent state

Steps to Reproduce:
* Create a custom UIPanGestureRecognizer subclass.
* Override only [UIGestureRecognizer touchesMoved:withEvent:]. After calling the method on super, ignore any touch.
* Create an instance of the gesture recognizer with minimumNumberOfTouches set to 2.
* Observe the state changes in the action method.

I have attached a sample project. Un/comment out line 24 in ViewController.m and observe logs while performing a pan with 2 touches.


Expected Results:
* Since a touch is being ignored, the recognizer should move to the UIGestureRecognizerStateFailed and subsequently be reset. This is because the recognizer is no longer getting the minimum number of touches.
* The recognizer should not react to tap or pinch gestures
* The numberOfTouches should not keep increasing

Actual Results:
* The recognizer is stuck in UIGestureRecognizerStateChanged
* The recognizer calls the action method for tap and pinch gestures as well
* Calling numberOfTouches when the incorrect action method is called results in the a large number of touches returned (all of them not part of recognition)