http://swift-lang.org/docs/index.php
http://swift-lang.org/guides/release-0.94/userguide/userguide.html
苹果Swift编程语言入门教程【中文版】
http://www.25pp.com/news/news_60984.html
Start Developing iOS Apps Today
https://developer.apple.com/library/ios/referencelibrary/GettingStarted/RoadMapiOS/index.html
Object-Oriented Programming with Objective-C