Our latest book, Learning Swift, is now available! The book will cover everything you need to learn Swift, for iOS, OS X, watchOS, and tvOS. Grab the early release (all updates to final release included) (via O'Reilly Media). Or pre-order it on Amazon! We'll be covering iOS 9.x, Swift 2.0/2.1, and the iPad Pro as well. This is probably the best book we've written yet!