It's How different
File: InterfaceController.swift ------------------------- @IBOutlet weak var bg: WKInterfaceGroup! override func awakeWithContext(context: AnyObject?) { var images: [UIImage] = [] for (var i=1; i<71; i++){ images.append(UIImage(named: String(format: "jackson%d.jpg", i))!) } let animatedImage = UIImage.animatedImageWithImages( images, duration: 5) self.bg.setBackgroundImage(animatedImage) self.bg.startAnimatingWithImagesInRange( NSRange(location: 0, length: 70), duration: 5, repeatCount: 0) }