多点触摸的简单示例

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{touchLabel.text = @"Touches Began";}- (void) touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{touchLabel.text = @"Touches Cancelled";}- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{touchLabel.text = @"Touches Stopped";}- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{touchLabel.text = @"Drag detected";}

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需要注意的是：在Interface Builder中，必须将view的属性Interaction里的两项User Interaction Enabled和Multiple Touch都勾上。