使用MapKit在地图上使用图钉显示自定义位置(Swift)

import MapKit

class ViewController: UIViewController, MKMapViewDelegate {
    @IBOutlet weak var mapView: MKMapView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置地图显示区域
        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)
        
        // 创建自定义图钉
        let annotation = CustomAnnotation(title: "Custom Location", coordinate: initialLocation.coordinate)
        
        // 添加图钉到地图上
        mapView.addAnnotation(annotation)
    }
    
    // 自定义图钉类
    class CustomAnnotation: NSObject, MKAnnotation {
        let title: String?
        let coordinate: CLLocationCoordinate2D
        
        init(title: String, coordinate: CLLocationCoordinate2D) {
            self.title = title
            self.coordinate = coordinate
        }
    }
    
    // MKMapViewDelegate方法，自定义图钉的样式
    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
    }
}