本文介绍如何为iOS应用中的iPad和iPhone设备编写触摸事件处理程序。只需在UIController中重写特定的方法，如触摸开始、移动、结束及取消等，即可轻松实现触摸交互。
新手在编写ipad和iphone的屏幕触摸事件的时候往往不知道如何处理。
其实只要再UIController里面重写一下方法即可：
- (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;
其实只要再UIController里面重写一下方法即可：
- (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;
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