Very often when making games, we focus on specific frameworks like Sprite Kit, Cocos 2D or tools like Unity and Game Maker. It turns out that there's a much-overlooked alternative: UIKit. Yup, plain old UIKit is perfectly suitable for simpler games like memory tile games, word puzzles and others that don't require extensive use of sprites or complex visual hierarchies. Caroline Begbie shows you how to make a fun letter game using nothing more than UIKit in this three part tutorial (part 2, part 3).
Thomas Kollbach writes "... at some point, you will encounter code signing and provisioning. And more often than not, this is when you will start cursing." 😠 Well put Thomas. Code signing and provisioning are complex but are essential to distributing your iOS games. If you want a very approachable explanation of how certificates, provisioning profiles and code signing work to secure your iOS games, read on.
Scene Kit is a new framework in iOS 8 that allows you to more simply develop 3D iOS games - it's significantly easier to use than OpenGL. I'd say that Scene Kit is to 3D what Sprite Kit is to 2D - a high-level framework that allows you to skip the nitty gritty of detailed rendering algorithms and instead structure your game using simpler hierarchies of nodes, animations and effects. Silviu Pop explains how to create a basic Scene Kit project and then how to render some neat patterns of spheres. Following this tutorial will give you a good start towards building your own 3D iOS games with Scene Kit.