override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let rect = CGRectMake(130, 100, 0, 0)
    let uiSwitch = UISwitch(frame: rect)
    uiSwitch.setOn(true, animated: true)
    uiSwitch.addTarget(self, action: "switchChanged", forControlEvents: UIControlEvents.ValueChanged)

    self.view.addSubview(uiSwitch)
}

func switchChanged(uiSwitch: UISwitch) {
    var message = "Turn on the switch"
    if uiSwitch.on {
        message = "Turn off the switch"
    }
    let alert = UIAlertController(title: "Information", message: message, preferredStyle: UIAlertControllerStyle.Alert)
    let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil)
    alert.addAction(action)
    self.presentViewController(alert, animated: true, completion: nil)
}