How to make a view controller as splash screen in swift 3?

I am trying to make a view controller from storyboard as the splash screen in my application using swift 3. I am trying achieve the same effect as the splash screen does while loading the splash using "launch image". Since i have got an animation in the splash screen i wish to use a view controller as the splash screen in Swift 3. How to achieve this?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    self.window = UIWindow(frame: UIScreen.main.bounds)

    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let initialViewController = storyboard.instantiateViewController(withIdentifier: "splashScreen")

    self.window?.rootViewController = initialViewController
    self.window?.makeKeyAndVisible()
    return true
}