参考文章:
https://developer.apple.com/documentation/foundation/nsproxy
(苹果官方文档)
http://blog.sunnyxx.com/2014/08/24/objc-duck/
(objc与鸭子对象)
http://ios.jobbole.com/87856/
(NSProxy—少见却神奇的类)
http://www.jianshu.com/p/4d619b097e20
(神经病院Objective-C Runtime住院第二天——消息发送与转发)
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