Swift AppDelegate without Storyboard / XIB for iOS.

ACAppDelegate-iOS

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.backgroundColor = UIColor.black
        window?.rootViewController = ViewController()
        window?.makeKeyAndVisible()
        return true
    }
    
}

requires updates for swift 3

window = UIWindow(frame: UIScreen.main.bounds)
if let window = window {
    window.backgroundColor = UIColor.blackColor

@LarsEckart: Adjusted, thx for letting me know 👍