swiftUI中MapKit中的自定义注释

Question

我尝试在MapKit和SwiftUI中自定义我的注释

从下面的代码中，我在地图上搜索特定的坐标（坐标），并显示自定义注释。

1）我试图增加UIimage的大小，因为要变小（请参阅所附图片）并更改颜色，知道如何吗？

2）在应用程序启动后的地图中，它仅显示图标，在我点击图标后，注释会出现，您知道如何立即显示我的注释而不点击吗？

3）现在在注释中，我设法显示标题和副标题，如何同时显示坐标

struct MapView: UIViewRepresentable {

    let Mm : MapManager
    let coord = CLLocationCoordinate2D(latitude: 52.28792, longitude: 4.73415327)

    class Coordinator: NSObject, MKMapViewDelegate {
        var parent : MapView

        init(_ parent: MapView) {
            self.parent = parent
        }

        func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
            let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "TESTING NOTE")
            annotationView.canShowCallout = true
            annotationView.image = UIImage(systemName: "location.circle")

            return annotationView
        }


    }
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    func makeUIView(context: Context) -> MKMapView {

    let view =  MKMapView(frame: .zero)
        Mm.georeverseCoordinate(coord) { (pin) in

                if let pinOK = pin {

                    view.removeAnnotation(pinOK)
                    view.mapType = MKMapType.satellite
                    let span = MKCoordinateSpan(latitudeDelta: 0.04, longitudeDelta: 0.04)
                    let region = MKCoordinateRegion(center: self.coord, span: span)
                    view.setRegion(region, animated: true)
                    view.delegate = context.coordinator
                    view.addAnnotation(pinOK)
                }

            }
        return view
    }

    func updateUIView(_ view: MKMapView, context: Context) {

    }

}

地图管理员

class MapManager: NSObject, CLLocationManagerDelegate {

    static let shared = MapManager()




    func georeverseCoordinate(_ coord: CLLocationCoordinate2D , closure:  @escaping (Pin?) -> Void) {

        let location = CLLocation(latitude: coord.latitude, longitude: coord.longitude)


        let geocoder = CLGeocoder()

        geocoder.reverseGeocodeLocation(location) { (arrayResponse, error) in
            if let errorTest = error {
                debugPrint(errorTest.localizedDescription)
                closure(nil)
                return
            }

            if let arrayPins = arrayResponse {

                if let valorePinArray = arrayPins.first {

                    debugPrint(valorePinArray.locality!)
                    debugPrint(valorePinArray.isoCountryCode!)

                    let pin = Pin(title: valorePinArray.locality!, subtitle: valorePinArray.isoCountryCode!, coordinate: valorePinArray.location!.coordinate)

                    closure(pin)

                }
                else { closure(nil) }
            }
            else { closure(nil) }
        }
    }
}

引脚模型

class Pin:NSObject, MKAnnotation {

    var title : String?
    var subtitle : String?
    var coordinate : CLLocationCoordinate2D
    var color: UIColor?

    init(title: String?, subtitle: String?, coordinate: CLLocationCoordinate2D) {
        self.title = title
        self.subtitle = subtitle
        self.coordinate = coordinate
    }


}

Answer 1

1]-似乎存在一个错误，使得使用tintColor和特定的渲染模式很难更改SF符号的颜色，但是有一种解决方法也可以通过一种简便的方法来更改符号的大小。

在mapView:viewFor annotation中添加以下内容：

annotationView.canShowCallout = true    
annotationView.image = UIImage(systemName: "location.circle")?.withTintColor(.systemGreen, renderingMode: .alwaysOriginal)
let size = CGSize(width: 40, height: 40)
annotationView.image = UIGraphicsImageRenderer(size:size).image {
     _ in annotationView.image!.draw(in:CGRect(origin:.zero, size:size))
}

2）-要在标注添加到地图后立即显示标注，请使用selectAnnotation。

view.addAnnotation(pinOK)
view.selectAnnotation(pinOK, animated: true)

3）-构造注释时可使用坐标，因此您只需在Pin类中更改init：

init(title: String?, subtitle: String?, coordinate: CLLocationCoordinate2D) {
    self.coordinate = coordinate
    self.title = "\(coordinate.latitude) : \(coordinate.longitude)"
    self.subtitle = subtitle
}