Swift Development with Cocoa
It covers everything an existing programmer needs to know to build OS X and iOS apps with Apple's new programming language, Swift. You can buy it at O'Reilly, Amazon, as well as many other reputable book sellers.
Ultimate Swift Programming
We also released, through O'Reilly and again working with Tim Nugent, a 12-hour video tutorial on Swift and Cocoa programming for OS X and iOS: Ultimate Swift Programming: Language, Frameworks, Tools. It's an excellent learning resource on its own, but it also serves as a great accompaniment for the book. It's available at O'Reilly.
On top of making pre-recorded videos (Hobart has been a hive of video production and post-production!), we also did two live webcasts for O'Reilly: one on Five Swift Essentials, and one on Building a game in under an hour with Unity. These were recorded and broadcast on Tuesday, 11 February 2015/Wednesday, 12 February 2015 (depending on your timezone), and by all accounts were a great success. Both webcasts were recorded, and the videos are available in their original format via the links above. We'll also post the code and notes right here when it's ready (in a day or two).
We're working on five more books at the moment (yes, we're possibly insane), and we'll be announcing them very soon. Stay tuned for news!