enum FadeType: NSTimeInterval { case Normal = 0.2, Slow = 1.0 } extension UIView { func fadeIn(type: FadeType = .Normal, completed: (() -> ())? = nil) { fadeIn(duration: type.rawValue, completed: completed) } /** For typical purpose, use "public func fadeIn(type: FadeType = .Normal, completed: (() -> ())? = nil)" instead of this */ func fadeIn(duration: NSTimeInterval = FadeType.Slow.rawValue, com
