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app_delegate.rb

class AppDelegate
  
  attr_accessor :window, :storyboard
  
  def application(application, didFinishLaunchingWithOptions: launchOptions)
    
    # Switch to a new rootViewController with transition
    UIView.transitionWithView(
      @window,
      duration: 0.5,
      options: UIViewAnimationOptionTransitionFlipFromLeft,
      animations: lambda do
        @window.rootViewController = @storyboard.instantiateViewControllerWithIdentifier("ViewController")
      end,
      completion: nil
    )
    
  end
  
end