Ios 自定义地理位置的简单指南针方向

指向自定义地理位置方向的简单指南针，您可以通过提供该位置的纬度和经度来指定该位置。 我试过了，但也有错误 我不知道这个错误在哪里

类ViewController:UIViewController、CLLocationManagerDelegate{ var locationmanager:CLLocationManager

@IBOutlet var arrowImageView: UIImageView!

var currentHeading = CLHeading()

var userLocation: CLLocationCoordinate2D!
var destLocation: CLLocationCoordinate2D!

var latitudeOfTargetedPoint = 48.858093
var longitudeOfTargetedPoint = 2.294694

var angle:Float!

override func viewDidLoad() {
    super.viewDidLoad()

   locationmanager = CLLocationManager()
    locationmanager.delegate = self
    locationmanager.desiredAccuracy = kCLLocationAccuracyBest
    locationmanager.requestWhenInUseAuthorization()
    locationmanager.startUpdatingLocation()
    locationmanager.distanceFilter = 100.0
    locationmanager.startUpdatingHeading()
}

func showUserAndDestinationOnMap()
{
    // Calculate the rectangle that contains the current position and the destination
    var maxLat:Double = fmax(userLocation.latitude,  latitudeOfTargetedPoint)
    var maxLon:Double = fmax(userLocation.longitude, longitudeOfTargetedPoint)

    var minLat:Double = fmin(userLocation.latitude,  latitudeOfTargetedPoint)
    var minLon:Double = fmin(userLocation.longitude, longitudeOfTargetedPoint)

    // Calculate the latitude, longitude width when displaying map
    var mapMargin:Double = 1.5;  // Width route enters (1.0) + margin (0.5)
    var leastCoordSpan:Double = 0.005;    // Enlarge maximum value when the display
    var span_x:Double = fmax(leastCoordSpan, fabs(maxLat - minLat) * mapMargin);
    var span_y:Double = fmax(leastCoordSpan, fabs(maxLon - minLon) * mapMargin);

    var span:MKCoordinateSpan = MKCoordinateSpanMake(span_x, span_y);

    // Calculate the center of the destination your location
    var center:CLLocationCoordinate2D = CLLocationCoordinate2DMake((maxLat + minLat) / 2, (maxLon + minLon) / 2);
    var region:MKCoordinateRegion = MKCoordinateRegionMake(center, span);




       }


func locationManager(manager: CLLocationManager!, didUpdateToLocation newLocation: CLLocation!, fromLocation oldLocation: CLLocation!) {

    self.showUserAndDestinationOnMap()


}


func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
    println(error)
}
func locationManager(manager: CLLocationManager!, didUpdateHeading newHeading: CLHeading!) {

    var degrees = newHeading.magneticHeading

    if (degrees > 180)
    {
        degrees = 360 - degrees;
    }
    else
    {
        degrees = 0 - degrees;
    }

    //    Rotate the arrow image
    if self.arrowImageView != nil {

        UIView.animateWithDuration(3.0, animations: { self.arrowImageView.transform = CGAffineTransformRotate(self.arrowImageView.transform,self.DegreesToRadians(degrees) )  })

    }

}

func degreestoradis（值：Double）->CGFloat{ 返回CGFloat（值*M_PI/180.0） }

func RadiansToDegrees（值：Double）->CGFloat{ 返回CGFloat（值*180.0/M_PI）}

如果有人能做到这一点

---

对不起，我的英文是：p~

有什么错误/消息？哪些行？没有错误项目正在工作，但问题在于箭头如果我运行应用程序箭头图像旋转很快，我希望箭头指南针指向方向，如果你不明白，请在此处下载项目@Paulw11检查链接