Event Handling Guide for iOS——由触摸事件传递想到的
先帖官方文档地址
https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/event_delivery_responder_chain/event_delivery_responder_chain.html
Event Delivery: The Responder Chain——事件传递:响应链
(未完待续)