堆与栈的区别
http://my.oschina.net/jilin/blog/402054
atomic与nonatomic区别
https://www.douban.com/note/486901956/
OC中关键字的区别
http://www.cnblogs.com/csj007523/archive/2012/07/23/2605662.html
http://www.cnblogs.com/allen99/p/4531823.html
代理协议
http://blog.csdn.net/yxwlzsh/article/details/46729931
NSOperationQueue
http://blog.csdn.net/q199109106q/article/details/8566222
KVO和KVC
http://www.cnblogs.com/kenshincui/p/3871178.html
Runtime
http://www.jianshu.com/p/927c8384855a
数据持久化
plist文件（属性列表）
preference（偏好设置）
NSKeyedArchiver（归档）
SQLite 3
CoreData
多线程
http://www.jianshu.com/p/0b0d9b1f1f19
面试题
http://zhangmingwei.iteye.com/blog/1748431
http://blog.csdn.net/xuehongnizhao/article/details/51066424
http://blog.csdn.net/hanangellove/article/details/45033453
http://www.itcast.cn/news/20160302/17201549876.shtml
笔试题
http://blog.sina.com.cn/s/blog_b0c5954101014upb.html
