This book was a disappointment. After less than a year some of the examples were useless because at least one thing was deprecated (Download favicons example, and it was hated thing with an alternative). A lot of times I was on a wild goose chase. So I gave up, Apple's docs look more friendly than this book. The authors could've supported this book longer than six or seven months but I understand that rewriting this book under a new title (https://www.goodreads.com/book/show/2...) is more important. Don't buy this book
This book was exactly what I needed. An introduction to Swift and Cocoa[Touch] for someone that's already a coder. So, if that's you, go for it. I only cared about Cocoa and not CocoaTouch, but thankfully, skipping over the iOS sections was easy enough and doing the reverse if you don't care about OSX will be easy as well.