如何在MKMapView上禁止旋转但显示方向？

Question

对于我的项目，我希望在MKMapView上显示用户的方向指示，但不旋转地图（使用蓝色圆锥体）。

这里有一个要点

此外，启用mapView.setUserTrackingMode(MKUserTrackingMode.FollowWithHeading, animated: true)后，我无法在地图上导航。

我尝试在mapView:didChangeUserTrackingMode中设置trackingMode，但它不起作用。

有什么想法吗？

- cappie013

Answer 1

我曾经遇到过同样的问题，后来通过使用 CLLocationManager 和 locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) 方法解决了它：

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))
    }
}

- Andrey Gordeev