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";
}

 

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。