如何在iOS/swift中根据当前位置的方位/航向值画一条线？

import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {
    let locationManager = CLLocationManager()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingHeading()
    }
    
    // 实现CLLocationManagerDelegate的方法，获取设备的航向值
    func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
        let heading = newHeading.trueHeading // 获取真北方向的航向值
        
        // 根据航向值画线的逻辑
        drawLineWithHeading(heading)
    }
}

import MapKit

extension ViewController: MKMapViewDelegate {
    func drawLineWithHeading(_ heading: CLLocationDirection) {
        let mapView = MKMapView(frame: view.bounds)
        mapView.delegate = self
        view.addSubview(mapView)
        
        let coordinate = mapView.userLocation.coordinate // 获取当前位置的坐标
        
        let distance: CLLocationDistance = 1000 // 设置线的长度为1000米
        let angle = heading * .pi / 180 // 将航向值转换为弧度
        
        let dx = distance * sin(angle)
        let dy = distance * cos(angle)
        
        let newCoordinate = CLLocationCoordinate2D(latitude: coordinate.latitude + dx, longitude: coordinate.longitude + dy)
        
        let coordinates = [coordinate, newCoordinate]
        let polyline = MKPolyline(coordinates: coordinates, count: coordinates.count)
        
        mapView.addOverlay(polyline)
    }
    
    // 实现MKMapViewDelegate的方法，绘制线
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        if let polyline = overlay as? MKPolyline {
            let renderer = MKPolylineRenderer(polyline: polyline)
            renderer.strokeColor = UIColor.red
            renderer.lineWidth = 2.0
            return renderer
        }
        
        return MKOverlayRenderer()
    }
}