在地图上显示用户位置 SwiftUI

Question

我正在尝试加载地图并在用户位置上显示初始位置，并使用 SwiftUI 在地图上显示用户的位置。我不知道如何在 SwiftUI 中做到这一点。

我试图将 'view.showsUserLocation = true' 放在 updateUIView 函数中，但它不起作用。

import SwiftUI
import MapKit
struct MapView : UIViewRepresentable {
    func makeUIView(context: Context) -> MKMapView {
        MKMapView(frame: .zero)
    }

    func updateUIView(_ view: MKMapView, context: Context) {
        view.showsUserLocation = true
        let coordinate = CLLocationCoordinate2D(
            latitude: 34.011286, longitude: -116.166868)
        let span = MKCoordinateSpan(latitudeDelta: 2.0, longitudeDelta: 2.0)

        let region = MKCoordinateRegion(center: view.userLocation.location?.coordinate ?? coordinate, span: span)
        view.setRegion(region, animated: true)
    }
}

当我尝试打印它时，该位置为零。

Answer 1

在中添加密钥Privacy - Location When In Use Usage Description和描述Info.plist

然后尝试更新以下功能：

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

    view.showsUserLocation = true

    // Ask for Authorisation from the User.
    self.locationManager.requestAlwaysAuthorization()

    // For use in foreground
    self.locationManager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() {
        //        self.locationManager.delegate = self
         self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
         self.locationManager.startUpdatingLocation()

        //Temporary fix: App crashes as it may execute before getting users current location
        //Try to run on device without DispatchQueue

        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: {
            let locValue:CLLocationCoordinate2D = self.locationManager.location!.coordinate
            print("CURRENT LOCATION = \(locValue.latitude) \(locValue.longitude)")

            let coordinate = CLLocationCoordinate2D(
                latitude: locValue.latitude, longitude: locValue.longitude)
            let span = MKCoordinateSpan(latitudeDelta: 2.0, longitudeDelta: 2.0)
            let region = MKCoordinateRegion(center: coordinate, span: span)
            view.setRegion(region, animated: true)

        })
    }

}