主要是这两个帖子
http://yulingtianxia.com/blog/2014/11/05/objective-c-runtime/
http://tech.glowing.com/cn/objective-c-runtime/
然后，关于里面的代码实现有2个比较不错的博客，可以参考
http://blog.sunnyxx.com
http://www.cnblogs.com/biosli/p/NSObject_inherit_2.html
另外还可以补充其他一些：
//-----------------------------------刨根问底Objective－C Runtime ---------------------
http://chun.tips/blog/2014/11/05/bao-gen-wen-di-objective%5Bnil%5Dc-runtime(1)%5Bnil%5D-self-and-super/
http://chun.tips/blog/2014/11/05/bao-gen-wen-di-objective%5Bnil%5Dc-runtime-(2)%5Bnil%5D-object-and-class-and-meta-class/
http://chun.tips/blog/2014/11/06/bao-gen-wen-di-objective%5Bnil%5Dc-runtime(3)%5Bnil%5D-xiao-xi-he-category/
http://chun.tips/blog/2014/11/08/bao-gen-wen-di-objective%5Bnil%5Dc-runtime(4)%5Bnil%5D-cheng-yuan-bian-liang-yu-shu-xing/
就这些基本能搞懂这个runtime的原理了。
iOS开发 runtime实现原理以及实际开发中的应用
原文：http://my.oschina.net/caijunrong/blog/508738
