MKAnnotation，简单示例

使用MKAnnotation在地图上添加标注点

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

swift
let coordinate = CLLocationCoordinate2D(latitude: 37.331705, longitude: -122.030237)
let annotation = MyAnnotation(coordinate: coordinate, title: "Apple Park", subtitle: "Cupertino, CA")
mapView.addAnnotation(annotation)

swift
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    if annotation is MyAnnotation {
        let identifier = "MyAnnotation"
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
        if annotationView == nil {
            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
        } else {
            annotationView?.annotation = annotation
        }
        return annotationView
    }
    return nil
}