Make beautiful apps with beautiful code: use the elegant and concise Ruby programming language with RubyMotion to write truly native iOS apps with less code while having more fun. You’ll learn the essentials of creating great apps, and by the end of this book, you’ll have built a fully functional API-driven app. Whether you’re a newcomer looking for an alternative to Objective-C or a hardened Rails veteran, RubyMotion allows you to create gorgeous apps with no compromise in performance or developer happiness.
Pragmatic RubyMotion is just a beginners' book. I would recommend it to people who are already well adept with Objective C and have amateurish Ruby Skills. After reading this, I find RubyMotion is more of a prototyping tool rather than being used for a full blown application. A vast number of Objective-C APIs, like Notifications, Animations are yet missing.