tm_timer.rb

class AppDelegate

  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window =
      UIWindow.alloc.initWithFrame(UIScreen.mainScreen.applicationFrame)
    @window.makeKeyAndVisible

    @button = UIButton.buttonWithType(UIButtonTypeRoundedRect)
    @button.setTitle("start speech timer", forState:UIControlStateNormal)
    @button.sizeToFit
    @button.frame = CGRect.new(
      [10, @window.frame.size.height - 10 -
      @button.frame.size.height],
      @button.frame.size)
    @window.addSubview(@button)

    @button.addTarget(self, action:"vibrate",
      forControlEvents:UIControlEventTouchUpInside)
    true
  end

  def vibrate
    AudioServicesPlayAlertSound KSystemSoundID_Vibrate

    random_color = UIColor.colorWithRed(rand, green: rand, blue:rand, alpha:1)
    animate_to_color random_color

    # animate_to_color UIColor.greenColor
    # animate_to_color UIColor.yellowColor
    # animate_to_color UIColor.redColor
  end

  def animate_to_color(color)
    UIView.animateWithDuration(1.5, delay: 0.0,
      options: UIViewAnimationOptionBeginFromCurrentState,
      animations: lambda {
        @window.backgroundColor = color
      },
      completion:lambda {|finished|
      })
  end

end