那些在学习iOS开发前就应该知道的事（part 1）
http://www.cocoachina.com/ios/20150608/12052.html?
英文原文：
Things I wish I had known before starting iOS development—Part 1
https://medium.com/ios-os-x-development/things-i-wish-i-had-known-before-starting-ios-development-part-1-421a05e8447e
