在触摸地图上添加mkannotation

import MapKit

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

class ViewController: UIViewController, MKMapViewDelegate {
    @IBOutlet weak var mapView: MKMapView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置地图的显示区域和缩放级别
        let initialLocation = CLLocation(latitude: 37.331705, longitude: -122.030237)
        let regionRadius: CLLocationDistance = 1000
        let coordinateRegion = MKCoordinateRegion(center: initialLocation.coordinate, latitudinalMeters: regionRadius, longitudinalMeters: regionRadius)
        mapView.setRegion(coordinateRegion, animated: true)
        
        // 添加标注点
        let annotation = CustomAnnotation(title: "Apple Park", subtitle: "Cupertino, CA", coordinate: CLLocationCoordinate2D(latitude: 37.331705, longitude: -122.030237))
        mapView.addAnnotation(annotation)
    }
    
    // 自定义标注点的样式
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if annotation is MKUserLocation {
            return nil
        }
        
        let identifier = "CustomAnnotation"
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
        
        if annotationView == nil {
            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
            annotationView?.canShowCallout = true
        } else {
            annotationView?.annotation = annotation
        }
        
        return annotationView
    }
}