Mar 24, 13
Read from January 15 to March 24, 2013
Not a bad introduction to a topic a lot of people want to know more about. I wonder if it would more difficult to digest if you didn't have a background in software development, specifically with languages in the C family. There would be a lot of additional concepts to master and verbiage before you could build simple games like "Simon Says" or an Arkanoid clone which is probably the best game you learn to build following this book.
After finishing this book you probably want to go on to a more advanced iOS development book, though there are a number of online tutorials and websites one could check out instead.