SwiftUIMapTypeSwitchApp.swift

//
//  TestMapAppApp.swift
//  TestMapApp
//
//  Created by Pavlo Vasylenko on 21.03.2022.
//

import SwiftUI
import Foundation
import MapKit

@main
struct TestMapAppApp: App {
    var mapModel = MapModel()
    var body: some Scene {
        WindowGroup {
            ContentView().environmentObject(mapModel)
        }
    }
}

class MapModel: ObservableObject {
    @Published var mapType = MKMapType.standard
    @Published var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: 35.685, longitude: 139.7514), span: MKCoordinateSpan(latitudeDelta: 0.2, longitudeDelta: 0.2))
}


struct ContentView: View {
    @EnvironmentObject var mapModel: MapModel

    @State private var mapType: Int = 0
    @State private var mapTypes = ["Standard",
//                                   "Satellite",
                                   "Hybrid"]

    var body: some View {
        ZStack (alignment: .topLeading) {
            MapView().edgesIgnoringSafeArea(.all)
            mapTools
        }
    }

    var mapTools: some View {
        HStack {
            Spacer()
            Picker(selection: Binding<Int> (
                get: {self.mapType},
                set: {
                    self.mapType = $0
                    self.mapModel.mapType = self.getMapType()
                }
            ), label: Text("")) {
                ForEach(0 ..< mapTypes.count) {
                    Text(self.mapTypes[$0])
                }
            }.pickerStyle(SegmentedPickerStyle())
            .labelsHidden()
            .frame(width: 222, height: 60)
            .clipped()
            Spacer()
        }
    }

    func getMapType() -> MKMapType {
        switch mapType {
        case 0: return .standard
//        case 1: return .satellite
        case 1: return .hybrid
        default:
            return .standard
        }
    }

}

struct MapView: UIViewRepresentable  {

    @EnvironmentObject var mapModel: MapModel

    let mapView = MKMapView()

    func makeUIView(context: Context) -> MKMapView {
        mapView.mapType = mapModel.mapType
        mapView.setRegion(mapModel.region, animated: true)
        return mapView
    }

    func updateUIView(_ uiView: MKMapView, context: Context) {
        uiView.mapType = mapModel.mapType
    }

}


//struct ContentView_Previews: PreviewProvider {
//    @EnvironmentObject var mapModel: MapModel
//    static var previews: some View {
//        ContentView().environmentObject(mapModel)
//    }
//}