如何“排外”处理多点触摸事件

最新推荐文章于 2020-12-17 00:02:41 发布

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最新推荐文章于 2020-12-17 00:02:41 发布

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分类专栏： ios 文章标签： ios 多点触摸 uiview 文档 apple

本文链接：https://blog.youkuaiyun.com/u011449777/article/details/23341493

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经常有网友问，如何避免同时处理多个多点触摸事件？实际上，在Apple的官方文档中已经提供了解决方案。

Apple在UIView的multipleTouchEnabled属性的讨论中提到：如果你希望这个视图“排外”处理多点触摸事件，只需要把组的这一属性，属性的值是multipleTouchEnabled和exclusivetouch的值同时设为YES。

multipleTouchEnabled
A Boolean value that indicates whether the receiver handles multi-touch events.

@property(nonatomic, getter=isMultipleTouchEnabled) BOOL multipleTouchEnabled
Discussion
When set to YES, the receiver receives all touches associated with a multi-touch sequence. When set to NO, the receiver receives only the first touch event in a multi-touch sequence. The default value of this property is NO.

Other views in the same window can still receive touch events when this property is NO. If you want this view to handle multi-touch events exclusively, set the values of both this property and the exclusiveTouch property to YES.

Availability
Available in iOS 2.0 and later.
See Also
  @property exclusiveTouch
Related Sample Code
aurioTouch2
Declared In
UIView.h