title: Is it possible to add a SpriteKit scene with transparent BG on top of a uikit view hierarchy?
body: <p>I'd like to take advantage of the particle effects (and maybe some other stuff) in SpriteKit but my app is mainly rooted in UIKit. Does the SpriteKit framework allow you to create a scene with a transparent background that I can place on top of my UIKit view hierarchy?</p>