Scala (2.10) version of the basic iOS app example of RoboVM: http://www.robovm.org/docs.html#ios-example

RoboTest.scala

import org.robovm.cocoatouch.coregraphics._
import org.robovm.cocoatouch.foundation._
import org.robovm.cocoatouch.uikit._



object Utils {
  import scala.language.implicitConversions

  implicit class RichUIControl(control: UIControl) {
    def onTouchUpInside(handler: (UIControl, UIEvent) => Unit) {
      control.addOnTouchUpInsideListener(new UIControl.OnTouchUpInsideListener {
        override def onTouchUpInside(c: UIControl, e: UIEvent) = handler(c,e)
      })
    }
    
    def onTouchUpInside(handler: => Unit) { onTouchUpInside { (_,_) => handler }}
  }
  
  def autoReleasePool(block: => Unit) {
    val pool = new NSAutoreleasePool()
    block
    pool.drain()
  }
  
  implicit def tuple4ToCGRect(tuple4: (Float,Float,Float,Float)) = {
    val (x,y,w,h) = tuple4
    new CGRect(x,y,w,h)
  }
}


class RoboTest extends UIApplicationDelegate.Adapter {

  var window: UIWindow = _

  override def didFinishLaunching(application: UIApplication, launchOptions: NSDictionary[_ <: NSObject, _ <: NSObject]) = {
    import Utils._
  
    val label = new UILabel(50.0f, 221.0f, 220.0f, 37.0f)
    label.setText("")
    label.setTextAlignment(NSTextAlignment.Center)
  
    val button = UIButton.fromType(UIButtonType.RoundedRect)
    button.setFrame(50.0f, 121.0f, 220.0f, 37.0f)
    button.setTitle("Click me!", UIControlState.Normal)

    var clickCount = 0
 
    button.onTouchUpInside { (_,event) =>
      label.setText(event.getTimestamp.toString)
      button.setTitle("Hello from scala #" + {clickCount = clickCount + 1; clickCount}, UIControlState.Normal);
    }

    window = new UIWindow(UIScreen.getMainScreen().getBounds())
    window.setBackgroundColor(UIColor.lightGrayColor())
    window.addSubview(button)
    window.addSubview(label)
    window.makeKeyAndVisible()

    true
  }  
}

object RoboTest {
  def main(args: Array[String]) {
    Utils.autoReleasePool {
      UIApplication.main(args, null, classOf[RoboTest])
    }
  }
}