gistfile1.rb

require 'rubycocoa'
 
class MyAppDelegate < OSX::NSObject
  def applicationDidFinishLaunching(application)
    @window = OSX::UIWindow.alloc.initWithFrame(OSX::UIScreen.mainScreen.bounds)
    @window.setBackgroundColor(OSX::UIColor.darkGrayColor)
    @window.makeKeyAndVisible
 
    @textView = OSX::UILabel.alloc.initWithFrame(OSX::UIScreen.mainScreen.bounds)
    @textView.setText("hello RubyCocoa world")
    @textView.setTextAlignment(OSX::UITextAlignmentCenter)
    @textView.setFont(OSX::UIFont.boldSystemFontOfSize(24))
    @textView.setTextColor(OSX::UIColor.whiteColor)
    @textView.setBackgroundColor(OSX::UIColor.clearColor)
 
    @window.addSubview(@textView)
   end
end
 
OSX.UIApplicationMain(0, nil, nil, "MyAppDelegate")