Can't make UIBarButtonItem's action work

Question

I've got a controller and a button. When the button is clicked, I want to show an UIAlertView. What I can't get to work is the UIBarButtonItem's action parameter.

In my controller

class TapController < UIViewController
  def alert
    alert = UIAlertView.new
    alert.message = "It's working"
    alert.show
  end

  def viewDidLoad
    super
    self.view.backgroundColor = UIColor.whiteColor
    right_button = UIBarButtonItem.alloc.initWithTitle("Go Deeper",
                                                       style:UIBarButtonItemStyleBordered,
                                                       target:self,
                                                       action:'alert')
    self.navigationItem.rightBarButtonItem = right_button
  end
end

My app/app_delegate.rb:

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    #UIScreen is the display the app runs on
    @window = UIWindow.new.initWithFrame(UIScreen.mainScreen.bounds)
    @window.makeKeyAndVisible

    controller = TapController.alloc.initWithNibName(nil, bundle: nil)
    @window.rootViewController = UINavigationController.alloc.initWithRootViewController(controller)

    true
  end
end

So it's very simple, but the UIBarButtonItem's target or action attributes doesn't work as expected.

Answer 1

Here's your problem. In your app delegate, you need to call alloc instead of new on UIWindow.

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