It is possible to code video games using Objective C without being a complete Objective-C expert. If, however, you are serious about building top quality games using Objective-C, then at some point you will need to master it. To this end, we are proud to show you the well respected title, Objective-C Programming: The Big Nerd Ranch Guide (2nd Edition). The text is aimed at beginner level and completely focusses on learning Objective-C and contains no gaming specific content whatsoever. This laser focus means you will get a wider comprehension of Objective-C coding. This will undoubtedly result in better game coding!
In Objective-C Programming: The Big Nerd Ranch Guide (2nd Edition) (Big Nerd Ranch Guides) put together by Aaron Hillegass & Mikey Ward and published by Big Nerd Ranch Guides, there will be no aliens, zombies or guns but furthering your knowledge in the pure language should not be dismissed.
Be aware that this is the paperback version. You can get the Kindle edition available by ordering on Amazon below:
Here at Game Code School we love the Big Nerd Ranch guides and have read most of them too. The project based learning means they are not just theory. Your learn something and you DO something with it. Look at the number of positive reviews this book has. If you want to learn Objective-C in a non-gaming setting, this is highly reccomended.
Here is the publishers list of contents: