显示用户坐标 SwiftUI

Question

我有自定义地图，用户位置上有别针。当我需要显示用户位置时。我尝试使用 CLLocationManager 显示坐标，但它们变成 0.0

struct MapView : UIViewRepresentable {
    
    func makeCoordinator() -> MapView.Coordinator {
        return MapView.Coordinator(parent1: self)
    }
    
    @Binding var title : String
    @Binding var subtitle : String
    
    func makeUIView(context: UIViewRepresentableContext<MapView>) ->  MKMapView {
        
        let map = MKMapView()
        let coordinate = CLLocationCoordinate2D(latitude: 55.757485,
                                               longitude: 37.632179)
        map.region = MKCoordinateRegion(center: coordinate,
                                        latitudinalMeters: 100,
                                        longitudinalMeters: 100)
        let annotation = MKPointAnnotation()
        annotation.coordinate = coordinate
        
        map.delegate = context.coordinator
            
        map.addAnnotation(annotation)
        return map
    }
    
    func updateUIView(_ uiView: MKMapView, context: UIViewRepresentableContext<MapView>) {}

    class Coordinator: NSObject , MKMapViewDelegate {
        
        var parent : MapView
        init(parent1: MapView) {
            parent = parent1
        }
        
        func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
            
            let pin = MKPinAnnotationView(annotation: annotation,
                                          reuseIdentifier: "pin")
            pin.isDraggable = true
            pin.pinTintColor = .blue
            pin.animatesDrop = true
            
            return pin
        }
        
        func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, didChange newState: MKAnnotationView.DragState, fromOldState oldState: MKAnnotationView.DragState) {
            
            CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: (view.annotation?.coordinate.latitude)!,
                                               longitude: (view.annotation?.coordinate.longitude)!)){ (places, err) in
                
                if err != nil {
                    print((err?.localizedDescription)!)
                    return
                }
                
                self.parent.title = (places?.first?.name ?? places?.first?.postalCode)!
                self.parent.subtitle = (places?.first?.locality ?? places?.first?.country ?? "None")
            }
        }
    }
}

这是我的起点

let coordinate = CLLocationCoordinate2D(latitude: 55.757485,
                                        longitude: 37.632179)

所以我需要在这个笔划中添加用户坐标而不需要我已经询问过的许可

Answer 1

您所要做的就是使showsUserLocation var 为真。(Look at the docs)

func makeUIView(context: UIViewRepresentableContext<MapView>) ->  MKMapView {
    
    let map = MKMapView()
    let coordinate = CLLocationCoordinate2D(latitude: 55.757485, longitude: 37.632179)
    map.region = MKCoordinateRegion(center: coordinate, latitudinalMeters: 100, longitudinalMeters: 100)
    let annotation = MKPointAnnotation()
    annotation.coordinate = coordinate

    // new code...
    map.showsUserLocation = true

    map.delegate = context.coordinator
        
    map.addAnnotation(annotation)
    return map
    
}

从 iOS 14 开始，您可以使用原生 SwiftUI Map。这可能比桥接到 UIKit 更容易使用