This project forked from developererenliu/easykvo
自己实现系统KVO，简单易用，不会像原生KVO那样“矫情”很容易导致Crash，而且提供了block方式的回调
系统的KVO存在很多问题，例如重复添加导致的多次回调，以及重复移除或忘记移除导致的崩溃。所以我基于Runtime写了套自定义的KVO，调用方式和原生的一样，并提供了block方式的回调，使代码更紧凑。
写的比较简单，可能会有一些其他bug。仅供技术交流，项目中尽量不要使用。如果要使用的话，推荐使用Facebook的KVOController。
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