GestureRecognizer puzzle.
GestureRecognizer puzzle.
- Subject: GestureRecognizer puzzle.
- From: David Rowland <email@hidden>
- Date: Thu, 21 Oct 2010 20:37:30 -0700
In my iPhone app I use beginTrackingWithTouch, etc. to handle a swipe and rotate an OpenGL object. I wanted to add pinch and rotate gestures to do the obvious things. I created a UIRotationGestureRecognizer and a UIPinchGestureRecognizer, added them to the control view and wrote the action methods. They worked just fine.
Then I realized that they operated exclusively. That is, once a rotation was recognized a pinch would not be recognized until the touch set was ended and another begun. The delegate method shouldRecognizeSimultaneouslyWithGestureRecognizer is there to let you specify that both should be handled, so I wrote one that simply returns YES.
That also works, but I see an odd behavior. The app works normally until I do a pinch-rotate. From then on all touches seem to be greatly delayed, a significant fraction of a second. Does the "simultaneous" method invoke something that hangs around and impedes touches?
thanks for any comments,
David
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