responder chain

UIResponder有一个nextResponder属性，通过该属性可以组成一个响应者链，事件或消息在其路径上进行传递
如果UIResponder没有处理传给它的事件，会将未处理的消息转发给自己的nextResponder

There are two general kinds of events: t***ouch events and motion events***. The primary event-handling methods for touches are touchesBegan:withEvent:, touchesMoved:withEvent:, touchesEnded:withEvent:, and touchesCancelled:withEvent:. The parameters of these methods associate touches with their events—€”especially touches that are new or have changed—€”and thus allow responder objects to track and handle the touches as the delivered events progress through the phases of a multi-touch sequence. Any time a finger touches the screen, is dragged on the screen, or lifts from the screen, a UIEvent object is generated. The event object contains UITouch objects for all fingers on the screen or just lifted from it.

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