Swift Standard Library Reference
https://developer.apple.com/library/prerelease/ios/documentation/General/Reference/SwiftStandardLibraryReference/
Using Swift with Cocoa and Objective-C
https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/
The
Swift Programming Language
https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/doc/uid/TP40014097-CH30-XID_861
https://developer.apple.com/swift/
https://developer.apple.com/technologies/
Swift资源大集中
有文档和视频，sample code..
https://developer.apple.com/swift/resources/