Simple Rubymotion app with UIAlertView

app_delegate.rb

class MyController < UIViewController

  def viewDidLoad
    self.view.backgroundColor = UIColor.whiteColor
    alert.show
  end
  
  # ==============
  # = Properties =
  # ==============

  def alert
    @alert ||= UIAlertView.alloc.initWithTitle("Alert Title", message: "This is the message", delegate: self, cancelButtonTitle: "Back", otherButtonTitles: "OK")
  end
  
  # =======================
  # = UIAlertViewDelegate =
  # =======================

  def alertView(alertView, clickedButtonAtIndex: indexPath)
    # do nothing...
  end
  
end

class AppDelegate
  
  def window
    @window ||= UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
  end
  
  
  def controller
    @controller ||= MyController.new
  end
  
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    window.rootViewController = controller
    window.makeKeyAndVisible
    true
  end
end