“(NSSet *)touches”和“(NSSet *)touches”之间的区别和“event.allTouches”在“touchesBegan:withEvent:”中
我需要移动、旋转和缩放 UIImageView 对象。在方法中...
touchesBegan(NSSet *)touches withEvent:(UIEvent *)event
我必须使用哪些接触？
(NSSet *)touches
或者
event.allTouches
换句话说，我的触摸在哪里？
I need to move, rotate and zoom an UIImageView object. In the method...
touchesBegan(NSSet *)touches withEvent:(UIEvent *)event
which touches do I have to use?
(NSSet *)touches
or
event.allTouches
In other words, where are my touches?
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作为参数传递的
touches是您视图中的触摸。event.allTouches包含事件的所有触摸，甚至是未在您的视图中启动的触摸。请随时阅读事件处理指南对于iOS，在Apple的文档中，用一些图片进行了解释，可能会帮助您更好地理解。
特别是 参数中的
touches与event.allTouches的区别是此处描述；）touchespassed as the parameter are the touches in your view.event.allTouchescontains all the touches of the event, even the one that didn't start in your view.Don't hesitate to read the Event Handling Guide for iOS in Apple's doc, it is explained with some pictures it will probably help you understand better.
Especially the difference between the
touchesin the parameters andevent.allTouchesis described here ;)