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Description
Playground 使用手册
https://developer.apple.com/library/ios/recipes/Playground_Help/_index.html
Playground Markup语法
https://developer.apple.com/library/ios/documentation/Xcode/Reference/xcode_markup_formatting_ref/index.html
playground 页面排序和共享
http://swift.gg/2016/02/05/sorting-and-sharing-playground-pages/
如何优雅地使用 Playground
http://www.swiftyper.com/playground-advance-usage/
http://ericasadun.com/
https://leanpub.com/playgroundsecretsandpowertips
https://leanpub.com/swiftdocumentationmarkup
The Swift Programming Language (Swift 2.1)
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/index.html