Due for release simultaneously alongside iOS 7, KoboldKit is a SpriteKit based game framework for creating 2D platform games. I linked to an article from Steffen Itterheim on 2D platforming games and physics engines a couple of weeks ago from the development of KoboldKit. It now appears to be ready for release and is just waiting for the NDA to be lifted. I wonder how many other frameworks we will see build on top of SpriteKit as time goes on?
Eli Ganem with a nice rundown of some common design patterns used in iOS apps. He runs through MVC (obviously), Singletons, Facades, Decorators, Adapters, Mementos and Observers in this article with a look how to implement them yourself or a peek into how they are already used in the iOS SDK.
Gus Mueller has open sourced a set of classes for reading and writing PSD files in Objective-C this week. This is most definitely not a trivial task and so this is a wonderful resource to have open sourced.
Remember all those standard colours that Apple talked about during the iOS 7 keynote? Well, Claas Lange has been kind enough to pop them all into a category for us.