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swift
15 days ago
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Prompt:

import SwiftUI
import MapKit
class MyPlacemark: CLPlacemark {}



struct MapView: View {
    //    @State private var mapStyle: MapStyle = .standard
    var mapStyle: MapStyle{
        return switch(mapStyleSelection){
        case 0: .standard
        case 1: .hybrid
        case 2: .imagery
        default: .standard
        }
    }
    func check(_ counter: Int8) -> Int8{
        if counter<2{
            return counter+1
        } else{
            return 0
        }
    }
    func newpos(_ counter: Int8) -> MapCameraPosition{
        var latitude: Double
        var longitude: Double
        var name : String
        switch counter{
        case 0:
            latitude = 48.7828538
            longitude = 9.1666874
            name = "dhbw"
            break
        case 1:
            latitude = 48.7749108
            longitude = 9.1799351
            name = "breuni"
            break
        case 2:
            latitude = 52.424879
            longitude = 13.378663
            name = "mbag berlin"
            break
        default:
            latitude = 0
            longitude = 0
            name = "0-0 Koords (error)"
        }
       // Marker(name, systemImage: "mappin.and.ellipse", coordinate: CLLocationCoordinate2D(latitude: latitude, longitude: longitude))
        let position: MapCameraPosition = .item(MKMapItem(placemark: MKPlacemark(coordinate: CLLocationCoordinate2D(latitude: latitude, longitude: longitude))))
        return position
    }
    @State private var mapStyleSelection: Int = 0
    @State private var currentPos: MapCameraPosition = .userLocation(fallback: .automatic)
    var body: some View {
        ZStack {
            Map(position: $currentPos)
                .mapStyle(mapStyle)
                .onAppear{
                    CLLocationManager().requestWhenInUseAuthorization()
                }
                
            VStack {
                Picker("", selection: $mapStyleSelection) {
                    Text("Standard").tag(0)
                    Text("Hybrid").tag(1)
                    Text("Satellite").tag(2)
                }
                .pickerStyle(SegmentedPickerStyle())
                HStack{
      
                var counter: Int8 = 0

                    
                    
                Button(action: {currentPos = .userLocation(fallback: .automatic)}, label: {
                    Image(systemName: "location.magnifyingglass")
                        .font(.system(size: 40))
                })
                    Button(action: {currentPos = newpos(counter)
                    counter = check(counter)}, label: {
                    Image(systemName: "paperplane.circle")
                    .font(.system(size: 40))
                })}
                Spacer()
            }
        }
    }
}

#Preview {
    MapView()
}

Ich habe diesen code. wie kann ich beim ersten button, welcher zur user position springt, auf ein bestimmtes level zoomen?


Antwort:


import SwiftUI
import MapKit

struct MapView: View {
    @State private var mapStyleSelection: Int = 0
    @State private var region: MKCoordinateRegion = MKCoordinateRegion(
        center: CLLocationCoordinate2D(latitude: 48.7828538, longitude: 9.1666874), 
        span: MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
    )

    var mapStyle: MKMapType {
        switch mapStyleSelection {
        case 1: return .hybrid
        case 2: return .satellite
        default: return .standard
        }
    }
    
    func check(_ counter: Int8) -> Int8 {
        return counter < 2 ? counter + 1 : 0
    }

    func newpos(_ counter: Int8) -> CLLocationCoordinate2D {
        switch counter {
        case 0:
            return CLLocationCoordinate2D(latitude: 48.7828538, longitude: 9.1666874)
        case 1:
            return CLLocationCoordinate2D(latitude: 48.7749108, longitude: 9.1799351)
        case 2:
            return CLLocationCoordinate2D(latitude: 52.424879, longitude: 13.378663)
        default:
            return CLLocationCoordinate2D(latitude: 0, longitude: 0)
        }
    }

    var body: some View {
        ZStack {
            MapViewRepresentable(region: $region, mapType: mapStyle)
                .onAppear {
                    CLLocationManager().requestWhenInUseAuthorization()
                }

            VStack {
                Picker("", selection: $mapStyleSelection) {
                    Text("Standard").tag(0)
                    Text("Hybrid").tag(1)
                    Text("Satellite").tag(2)
                }
                .pickerStyle(SegmentedPickerStyle())

                HStack {
                    Button(action: {
                        if let userLocation = CLLocationManager().location?.coordinate {
                            region = MKCoordinateRegion(
                                center: userLocation,
                                span: MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
                            )
                        }
                    }, label: {
                        Image(systemName: "location.magnifyingglass")
                            .font(.system(size: 40))
                    })

                    var counter: Int8 = 0
                    Button(action: {
                        let newPosition = newpos(counter)
                        region = MKCoordinateRegion(
                            center: newPosition,
                            span: MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
                        )
                        counter = check(counter)
                    }, label: {
                        Image(systemName: "paperplane.circle")
                            .font(.system(size: 40))
                    })
                }
                Spacer()
            }
        }
    }
}

struct MapViewRepresentable: UIViewRepresentable {
    @Binding var region: MKCoordinateRegion
    var mapType: MKMapType

    func makeUIView(context: Context) -> MKMapView {
        let mapView = MKMapView()
        mapView.delegate = context.coordinator
        mapView.showsUserLocation = true // This line enables the user location
        return mapView
    }

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

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

    class Coordinator: NSObject, MKMapViewDelegate {
        var parent: MapViewRepresentable

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

        func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
            DispatchQueue.main.async {
                self.parent.region = mapView.region
            }
        }
    }
}

#Preview {
    MapView()
} 
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