如何在swift中将图标从kml文件添加到mapkit中

import MapKit

class ViewController: UIViewController {
    @IBOutlet weak var mapView: MKMapView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // 设置地图的初始显示区域
        let initialLocation = CLLocation(latitude: 37.7749, longitude: -122.4194)
        let regionRadius: CLLocationDistance = 1000
        let coordinateRegion = MKCoordinateRegion(center: initialLocation.coordinate, latitudinalMeters: regionRadius, longitudinalMeters: regionRadius)
        mapView.setRegion(coordinateRegion, animated: true)
    }
}

import MapKit

class ViewController: UIViewController {
    // ...
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // ...
        
        if let path = Bundle.main.path(forResource: "your_kml_file", ofType: "kml") {
            let url = URL(fileURLWithPath: path)
            if let parser = MKKMLParser(url: url) {
                parser.parse()
                let overlays = parser.overlays
                let annotations = parser.points
                mapView.addOverlays(overlays)
                mapView.addAnnotations(annotations)
            }
        }
    }
}

import MapKit

class CustomAnnotation: NSObject, MKAnnotation {
    var coordinate: CLLocationCoordinate2D
    var title: String?
    var subtitle: String?
    var icon: UIImage?
    
    init(coordinate: CLLocationCoordinate2D, title: String?, subtitle: String?, icon: UIImage?) {
        self.coordinate = coordinate
        self.title = title
        self.subtitle = subtitle
        self.icon = icon
    }
}

class ViewController: UIViewController {
    // ...
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // ...
        
        if let path = Bundle.main.path(forResource: "your_kml_file", ofType: "kml") {
            let url = URL(fileURLWithPath: path)
            if let parser = MKKMLParser(url: url) {
                parser.parse()
                let overlays = parser.overlays
                let annotations = parser.points
                
                // 自定义标注视图
                for annotation in annotations {
                    if let customAnnotation = annotation as? CustomAnnotation {
                        let annotationView = MKAnnotationView(annotation: customAnnotation, reuseIdentifier: "CustomAnnotation")
                        annotationView.image = customAnnotation.icon
                        mapView.addAnnotation(annotationView.annotation!)
                    }
                }
                
                mapView.addOverlays(overlays)
            }
        }
    }
}