Implementing mixed-orientation in RubyMotion for iOS

RubyMotionViewcontrollerOrientation.rb

#In Rakefile, set something like app.interface_orientations = [:portrait, :landscape_left, :landscape_right]
class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    application.setStatusBarStyle(UIStatusBarStyleBlackOpaque, animated:true)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    @window.rootViewController = NavigationController.alloc.initWithRootViewController(PortraitViewController.alloc.init)
    @window.makeKeyAndVisible
    true
  end

end

#The UINavigationController subclass forwards to topViewController.
class NavigationController < UINavigationController

  #####Orientation

  def shouldAutorotate
		self.topViewController.shouldAutorotate
  end

  def supportedInterfaceOrientations
		self.topViewController.supportedInterfaceOrientations
  end

end


#This is portrait only
class PortraitViewController < UIViewController
  def initWithNibName(nibName, bundle:nibBundle)
    super(nibName, nibBundle)

    self.view.backgroundColor = UIColor.blueColor
    b = UIButton.buttonWithType(UIButtonTypeRoundedRect)
    b.frame = [[60, 100], [200, 20]]
    b.setTitle('Show VC that rotates', forState:UIControlStateNormal)
    b.addTarget(self, action:'click', forControlEvents:UIControlEventTouchUpInside)
    self.view.addSubview(b)

    self
  end


  def click
    vc = PortraitAndLandscapeViewController.new
    self.navigationController.pushViewController(vc, animated:true)
  end

  #####Orientation

  def shouldAutorotate
    true
  end

  def supportedInterfaceOrientations
    UIInterfaceOrientationMaskPortrait
  end
  
end


class PortraitAndLandscapeViewController < UIViewController
  def initWithNibName(nibName, bundle:nibBundle)
    super(nibName, nibBundle)
    self.view.backgroundColor = UIColor.greenColor

    self
  end

  #####Orientation

  def shouldAutorotate
    true
  end

  def supportedInterfaceOrientations
    UIInterfaceOrientationMaskAllButUpsideDown
  end
  
end