如何在Mapview swift ios中设置自定义引脚镜像？

import MapKit

class CustomAnnotationView: MKAnnotationView {
    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        
        if let customAnnotation = annotation as? CustomAnnotation {
            image = customAnnotation.image // 设置自定义引脚镜像图像
        }
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
    override func draw(_ rect: CGRect) {
        if let customImage = image {
            customImage.draw(in: bounds)
        }
    }
}

class CustomAnnotation: NSObject, MKAnnotation {
    var coordinate: CLLocationCoordinate2D
    var image: UIImage? // 自定义引脚镜像图像
    
    init(coordinate: CLLocationCoordinate2D) {
        self.coordinate = coordinate
        super.init()
    }
}

// 在地图视图控制器中使用自定义引脚镜像
class MapViewController: UIViewController, MKMapViewDelegate {
    @IBOutlet weak var mapView: MKMapView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        mapView.delegate = self
        
        // 创建自定义引脚
        let customAnnotation = CustomAnnotation(coordinate: CLLocationCoordinate2D(latitude: 37.331705, longitude: -122.030237))
        customAnnotation.image = UIImage(named: "custom_pin") // 设置自定义引脚镜像图像
        
        // 添加自定义引脚到地图
        mapView.addAnnotation(customAnnotation)
    }
    
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if annotation is CustomAnnotation {
            let annotationView = CustomAnnotationView(annotation: annotation, reuseIdentifier: "CustomAnnotation")
            return annotationView
        }
        return nil
    }
}