another.im-ios/ConversationsClassic/View/Screens/Attachments/AttachmentLocationPickerView.swift

import CoreLocation
import MapKit
import SwiftUI
import UIKit

struct AttachmentLocationPickerView: View {
    @StateObject private var locationManager = LocationManager()
    @State private var region = MKCoordinateRegion(
        center: CLLocationCoordinate2D(latitude: 34.011_286, longitude: -116.166_868),
        span: MKCoordinateSpan(latitudeDelta: 0.2, longitudeDelta: 0.2)
    )

    var body: some View {
        MapView(coordinateRegion: $region)
            .onAppear {
                locationManager.start()
            }
            .onChange(of: locationManager.lastLocation) { newLocation in
                if let newLocation {
                    region.center = newLocation.coordinate
                }
            }
    }
}

class LocationManager: NSObject, ObservableObject, CLLocationManagerDelegate {
    private let locationManager = CLLocationManager()
    @Published var lastLocation: CLLocation?

    override init() {
        super.init()
        locationManager.delegate = self
    }

    func start() {
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
    }

    func locationManager(_: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        lastLocation = locations.first
    }
}

struct MapView: UIViewRepresentable {
    @Binding var coordinateRegion: MKCoordinateRegion

    func makeUIView(context: Context) -> MKMapView {
        let mapView = MKMapView()
        mapView.delegate = context.coordinator
        return mapView
    }

    func updateUIView(_ uiView: MKMapView, context _: Context) {
        uiView.setRegion(coordinateRegion, animated: true)
    }

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

    class Coordinator: NSObject, MKMapViewDelegate {
        var parent: MapView

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

        func mapView(_ mapView: MKMapView, regionDidChangeAnimated _: Bool) {
            parent.coordinateRegion = mapView.region
        }
    }
}