title: Cannot use instance member 'service' within property initializer; property initializers run before 'self' is available
body: <p>Im trying to get longitude and latitude from struct gService and set it on a Map.
  But can't initialize <code>@State var region</code>, because of error &quot;Cannot use instance member 'service' within property initializer; property initializers run before 'self' is available&quot; on <code>service.latitude</code> and <code>service.longitude</code></p>
  <pre><code>struct DetailCardView: View {
  
  let service: gService
  
  @State var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: service.latitude, longitude: service.longitude), span: MKCoordinateSpan(latitudeDelta: 0.0033, longitudeDelta: 0.0033))
  
  var body: some View {
  
  Map(coordinateRegion: $region, annotationItems: [MapPoint(coordinates: CLLocationCoordinate2D(latitude: service.latitude, longitude: service.longitude))]) { location in
                      MapAnnotation(coordinate: location.coordinates) {
                          Circle()
                              .stroke(.red, lineWidth: 3)
                              .frame(width: 50, height: 50, alignment: .center)
                      }
                  }
  </code></pre>
  <p>I googled this problem, but there were different cases.</p>