Found in 1 comment on Hacker News
liampronan · 2015-12-27 · Original thread
Not a book, but since your description asks for a "source":

Developing iOS 8 Apps with Swift[0]: Stanford course with a great professor that focuses on learning Swift with a heavy focus on the iOS SDK. Really great for getting the fundamentals for iOS programming, and the course assumes a solid programming background (e.g., MVC).

Book: Swift Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)[1]. This looks like it just came out, and I haven't read it, but I did read the authors' Obj. C Guide and their iOS Guide, and both were great, so I'm assuming the same for this one.

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