在UIResponder API中接触 [英] getting touches in UIResponder API

问题描述

所以，UIResponder有以下方法：

   - （void）touchesBegan：（NSSet *）touches withEvent： ）事件
  

我的问题是， c $ c>参数和 [event allTouches] ？

解决方案

如果您通过[event allTouches]进行搜索，并将它们与[touches anyObject]中的UITouch进行比较， ，你会找到一个匹配。

So, UIResponder has methods like:

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

My question is, what's the difference between the touches parameter, and [event allTouches]?

解决方案

All sets of touches are stored within event.

However, for convenience Apple separately provides the touch that triggered the touchesBegan method to be invoked as a parameter.

If you searched through [event allTouches] and compared them to the UITouch within [touches anyObject], you would find a match.

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