title: Fade between two different SKTextures on SKSpriteNode
body: <p>Does anyone know if there is a way to fade (over time) between two different <code>SKTexture</code>s on an <code>SKSpriteNode</code>. I am assuming that you can't do this directly and plan to use a duplicate child sprite with a higher <code>ZPosition</code> to realise the fade, but I just wanted to check that there was not some method using <code>SKAction</code>(s) that I had over looked.</p>