gistfile1.rb

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    setup_window
  end

  def window
    @window ||= UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
  end

  private
  def setup_window
    window.rootViewController = UIViewController.new
    window.makeKeyAndVisible
  end
end