How to disallow rotation on MKMapView but show heading? - swift

Question

For my project, I would like to put on a MKMapView the heading of the user without rotating the map (with the blue cone).
Here's a gist
Furthermore, with mapView.setUserTrackingMode(MKUserTrackingMode.FollowWithHeading, animated: true) enable, I can't navigate trough my map.
I tried to set the trackingMode on the mapView:didChangeUserTrackingMode but It's not working.
Any idea ?

Answer 1

I had the same issue and resolved it by using CLLocationManager and locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) method:
class MyViewController: UIViewController {
#IBOutlet weak var mapView: MKMapView!
weak var userAnnotationView: MKAnnotationView?
var locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
mapView.showsUserLocation = true
mapView.delegate = self
locationManager.delegate = self
locationManager.startUpdatingHeading()
}
}
// MARK: - MKMapViewDelegate
extension MyViewController: MKMapViewDelegate {
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if let annotation = annotation as? MKUserLocation {
// User
let reuseIdentifier = "UserAnnotationView"
let annotationView: MKAnnotationView
if let view = mapView.dequeueReusableAnnotationView(withIdentifier: reuseIdentifier) {
annotationView = view
} else {
annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
}
annotationView.image = UIImage(named: "userLocationWithoutHeading")
userAnnotationView = annotationView
return annotationView
} else {
return nil
}
}
}
// MARK: - CLLocationManagerDelegate
extension MyViewController: CLLocationManagerDelegate {
func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
guard let userAnnotationView = userAnnotationView else { return }
userAnnotationView.image = UIImage(named: "arrowUp")
let rotationAngle = heading.magneticHeading * Double.pi / 180.0
userAnnotationView.transform = CGAffineTransform(rotationAngle: CGFloat(rotationAngle))
}
}