joyh/generousEdgePan

more forgiving UIScreenEdgePanGestureRecognizer implementation

generousEdgePan

More forgiving UIScreenEdgePanGestureRecognizer implementation.

When being used on a UIScrollView or its subclasses, UIScreenEdgePanGestureRecognizer is not forgiving enough and too hard to activate.

We can make UIScreenEdgePanGestureRecognizer more generous by doing this.

1. Set delegate of the UIScreenEdgePanGestureRecognizer, so it can be simultaneously recognized with scrollView's UIPanGestureRecognizer.
2. Require UIScreenEdgePanGestureRecognizer failure for scrollView's UIPanGestureRecognizer recognition.
   e.g. [scrollView.panGestureRecognizer requireGestureRecognizerToFail:edgeGR];