iBooks：
The Swift Programming Language
https://itunes.apple.com/jp/book/swift-programming-language/id881256329?mt=11
Using Swift with Cocoa and Objective-C
https://itunes.apple.com/jp/book/using-swift-cocoa-objective/id888894773?mt=11

ドキュメント：
The Swift Programming Language
https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/
Using Swift with Cocoa and Objective-C
https://developer.apple.com/library/content/documentation/Swift/Conceptual/BuildingCocoaApps/
Swift Standard Library
https://developer.apple.com/reference/swift

他
http://swiftdoc.org/
https://swift.org/
https://developer.apple.com/swift/blog/

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