MKMapView：自定义视图，而不是 Annotation Pin

自定义视图的MKMapView

swift
import UIKit
import MapKit
class CustomAnnotationView: MKAnnotationView {
    
    private let imageView: UIImageView = {
        let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
        imageView.contentMode = .scaleAspectFit
        return imageView
    }()
    
    private let label: UILabel = {
        let label = UILabel(frame: CGRect(x: 0, y: 50, width: 50, height: 20))
        label.textAlignment = .center
        label.font = UIFont.systemFont(ofSize: 12)
        return label
    }()
    
    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        
        self.addSubview(imageView)
        self.addSubview(label)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func prepareForDisplay() {
        super.prepareForDisplay()
        
        if let annotation = self.annotation as? CustomAnnotation {
            self.imageView.image = annotation.image
            self.label.text = annotation.title
        }
    }
}
class CustomAnnotation: NSObject, MKAnnotation {
    var coordinate: CLLocationCoordinate2D
    var title: String?
    var image: UIImage?
    
    init(coordinate: CLLocationCoordinate2D, title: String?, image: UIImage?) {
        self.coordinate = coordinate
        self.title = title
        self.image = image
    }
}

swift
class ViewController: UIViewController, MKMapViewDelegate {
    
    private let mapView: MKMapView = {
        let mapView = MKMapView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
        return mapView
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        mapView.delegate = self
        
        let annotation = CustomAnnotation(coordinate: CLLocationCoordinate2D(latitude: 37.331705, longitude: -122.030237), title: "Apple Park", image: UIImage(named: "apple_icon"))
        mapView.addAnnotation(annotation)
        
        view.addSubview(mapView)
    }
    
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if annotation is CustomAnnotation {
            let reuseIdentifier = "customAnnotation"
            var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseIdentifier)
            if annotationView == nil {
                annotationView = CustomAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
            } else {
                annotationView?.annotation = annotation
            }
            return annotationView
        }
        return nil
    }
}