SwiftUI Mapkit 未更新为 .follow on Startup

Question

我最近为我的 Swift 项目制作了一个 Mapview，问题是地图没有以用户的位置为中心，只有我必须按两次的 Button 才能使地图以用户为中心。 该代码还获得了用户位置，我怀疑这与代码在抽签前没有获得位置有关，但我还没有找到一种方法来实现它。 （抱歉，如果这可能是一个简单的解决方案，我对 Swift 和 SwiftUI 比较陌生）

这是 MapView 的代码：

import SwiftUI
import MapKit
import CoreLocation

let locationManager = CLLocationManager()

struct MapView: View {
    @State private var locationService = Location()
    @State private var userTrackingMode: MapUserTrackingMode = .follow
    @State var region = MKCoordinateRegion(center: MapDetails.defaultCenter, span: MapDetails.defaultSpan)

    var body: some View {
        ZStack{
            if(AppInfo.LocationIsEnabled){
                Map(
                    coordinateRegion: $region,
                    interactionModes: MapInteractionModes.all,
                    showsUserLocation: true,
                    userTrackingMode: $userTrackingMode
                )
                Button {
                    withAnimation{
                        userTrackingMode = MapUserTrackingMode.follow}
                }
            label: {
                if (userTrackingMode == MapUserTrackingMode.none){
                    Image(systemName: "location")
                        .padding(10)
                        .foregroundColor(.white)
                }
                else{
                    Image(systemName: "location.fill")
                        .padding(10)
                        .foregroundColor(.white)
                }
            }
            .background(.black.gradient)
            .cornerRadius(8, antialiased: /*@START_MENU_TOKEN@*/true/*@END_MENU_TOKEN@*/)
            .frame(maxWidth: .infinity,maxHeight: .infinity, alignment: .topTrailing)
            .shadow(radius: 5, x: 1, y: 1)
            .padding(10)
                
            }
            else
            {
                Text("Location Services Disabled")
            }
        }
    }
}

struct MapView_Previews: PreviewProvider {
    static var previews: some View {
        MapView()
    }
}

enum MapDetails {
    static let defaultCenter = CLLocationCoordinate2D(latitude: 48.0823, longitude: 11.3357)
    static let defaultSpan = MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01)
}
final class Location: NSObject, ObservableObject, CLLocationManagerDelegate {
    var locationManager: CLLocationManager?
    func initialize() {
        checkLocationAuthorization()
        if CLLocationManager.locationServicesEnabled(){
            locationManager = CLLocationManager()
            locationManager?.desiredAccuracy = kCLLocationAccuracyBest
            locationManager?.delegate = self
            print("Location Enabled")
        }
        else{
            print("Show an alert")
        }
        print("Location Initialized")
    }
    private func checkLocationAuthorization(){
        guard let locationManager = locationManager else {return}
        switch locationManager.authorizationStatus {
        case .notDetermined:
            locationManager.requestWhenInUseAuthorization()
        case .restricted:
            AppInfo.LocationIsEnabled = false
            print("Location is Restricted")
        case .denied:
            AppInfo.LocationIsEnabled = false
            print("Location is Denied")
        case .authorizedAlways, .authorizedWhenInUse:
            AppInfo.LocationIsEnabled = true
            MapView().region = MKCoordinateRegion(center: locationManager.location!.coordinate, span: MapDetails.defaultSpan)
        @unknown default:
            AppInfo.LocationIsEnabled = false
            break
        }
        print("LocationService Checked", AppInfo.LocationIsEnabled)
    }
    func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
        checkLocationAuthorization()
    }
}

我试过在Mapdraw之前调用location Initializer，但是好像不行……