iOS手势

iphone3之前手势要通过重载UIResponder的几个手势响应函数自行处理。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;

xcode4出来之后着实做和很多工作，为开发人员方便了动画，手势的，关于手势的类有：
轻击：UITapGestureRecognizer 
长按：UILongPressGestureRecognizer
滑动：UISwipeGestureRecognizer

平移：UIPanGestureRecognizer
捏合： UIPinchGestureRecognizer
旋转：UIRotationGestureRecognizer