Though Swift is a new language, it enters an ecosystem rich with history and depth. An exploration of Swift's place in the world of Objective-C and Cocoa yields a deeper understanding and appreciation of that context. From that foundation, one can cultivate a sense of how best to create apps that delight and inspire users in the years to come.
Revised and extended to focus on using Swift in iOS and OS X development, NSHipster: Obscure Topics in Cocoa & Swift is an essential updated guide. For those discovering the platform, the new edition will expose and explain Cocoa's rich underlying frameworks. Likewise, experienced developers making the leap from Objective-C will find familiar approaches rendered in clear, thoughtful examples that demonstrate the benefits of working in Swift.