Proud member and one of the founders of the GameDevAlliance.
Check out my game on the App Store : Galactic Runner
Are you looking for a very simple way to create pixel art, sprite sheets and animations on your phone or tablet ? Check out Sprite Creator by Skyler Lauren.
Some of my answers which may be useful for beginners in SpriteKit:
How to move an enemy towards moving player
How to generate a random curly line
Mario style rotating platform
initWithSize: vs initWithCoder
SKShapeNode node count issues