IPhone : How to rotate a Direction Arrow to particular location on swift

my app rotate an image to particular location but it's not work and the arrow rotate to the north i want the arrow rotate to the particular location if any one know what the problem ?

class ViewController: UIViewController,CLLocationManagerDelegate{

var angle = CGFloat()
var locationManager = CLLocationManager()
var arrowImageView : UIImageView? = UIImageView()
var latitudeOfTargetedPoint = CLLocationDegrees()
var longitudeOfTargetedPoint = CLLocationDegrees()
func DegreesToRadians (value: Double) -> CGFloat {
    return CGFloat(value * M_PI / 180.0)
}

func RadiansToDegrees (value: Double) -> CGFloat {
    return CGFloat(value * 180.0 / M_PI)      
}

override func viewDidLoad() {
    super.viewDidLoad()

    arrowImageView!.frame = CGRect(x: 100, y: 200, width: 100, height: 100)
    arrowImageView!.image = UIImage(named: "arrow.png")
    view.addSubview(arrowImageView!)

    if CLLocationManager.locationServicesEnabled() {

        println("CLLocationManager.locationServicesEnabled")

        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        self.locationManager.distanceFilter = 100.0;

        self.locationManager.startUpdatingLocation()
        self.locationManager.startUpdatingHeading()

        latitudeOfTargetedPoint = 46.948737
        longitudeOfTargetedPoint = 44.990891
        println("lat \(latitudeOfTargetedPoint)")
         println("lon \(longitudeOfTargetedPoint)")
    }

}