ios系統能力&api轉載連結彙總

1.判斷有無sim卡 http://www.2cto.com/kf/201306/223744.html

2.Let's Build xxx (如nsobject)系列- by Mike Ash,可以用做學習（了解很多ios内部的實作機制），很不錯  https://www.mikeash.com/pyblog/friday-qa-2013-02-08-lets-build-key-value-coding.html

3.method swizz http://www.cocoachina.com/applenews/devnews/2014/0225/7880.html

4.ios中的消息傳遞機制 http://www.cocoachina.com/applenews/devnews/2013/1216/7543.html

5.google地圖編碼api官方介紹 https://developers.google.com/maps/documentation/geocoding/?hl=zh-CN

6.ios版本檢測 http://www.cnblogs.com/weilaikeji/p/3331772.html