http://cocoalit.com/
https://www.cocoacontrols.com/
http://www.code4app.com/
http://www.mopapp.com/directory/best-resources-iphone-developers
http://code.tutsplus.com/series/learn-ios-sdk-development-from-scratch--mobile-14536
http://www.tutorialspoint.com/ios/
http://www.exiatian.com/cocoapods%E5%AE%89%E8%A3%85%E4%BD%BF%E7%94%A8%E5%8F%8A%E9%85%8D%E7%BD%AE%E7%A7%81%E6%9C%89%E5%BA%93/
http://github.ibireme.com/github/list/ios/
http://lldb.llvm.org/lldb-gdb.html