有什麼辦法讓UIGestureRecognizer
只會在UIGestureRecognizerStateBegan或是UIGestureRecognizerStateEnded
的時候呼叫target-action?
而不要UIGestureRecognizerStateChanged的時候送target-action
希望能避免在target-action中去判斷recognizer的state...
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