This tutorial gives an overview of the new features of the SpriteKit framework that were introduced in iOS 8. The new features are designed to make it easier to support advanced game effects and include support for custom OpenGL ES fragment shaders, lighting, shadows, advanced new physics effects and animations, and integration with SceneKit. In this tutorial, you'll learn how to implement these new features.
Source files for the Tuts+ tutorial: iOS 8: What's New in SpriteKit, Part 1
Read this tutorial on Tuts+.