 <p>You should go check the Sprite Kit Docs. <a href="https://developer.apple.com/library/ios/documentation/GraphicsAnimation/Conceptual/SpriteKit_PG/Introduction/Introduction.html" rel="nofollow">https://developer.apple.com/library/ios/documentation/GraphicsAnimation/Conceptual/SpriteKit_PG/Introduction/Introduction.html</a>. It's VERY helpful for beginners. A very good site to a few sprite kit tutorials might be raywenderlich.com.</p> <p>To your question:</p> <p>Go check sprite kits update method.</p>