Given those similarities, Rails 3 introduces the Responder to simplify the code further. For example, a few lines of code is all that's needed for a create action.
考虑到这些相似性，Rails 3引入了Responder来进一步简化代码。
2
YES if a responder object handled the action message, no if no object in the responder chain handled the message.
如果接受对象接收到事件信息就返回YES，在响应链中没有对象响应消息就返回NO。
3
If a responder object returns YES from this method, it can thereafter join the responder chain and receive touch events and action messages.