Unexpected acting of MapKit in SwiftUI - swiftui

Question

I'm stuck with the really strange problem. I'm implementing map into my SwiftUI app. It should act like a normal map (drag, scroll and so on). When changing position (that is binding point) the app gets an address via geocoder.
Also user can click "Change" button and enter address manually (with autocompletion). After selecting the address, the map should move to the reverse geocoded point.
Built-in SwiftUI Map() is a good thing, but... it's unreal to make it show buildings. And in the app it's something that matters. So, going with UIViewRepresentable gives me another strange problem.
If I set the center coordinate in UpdateUIView, the map stops any interactivity. Otherwise changing the address manually doesn't work.
What could be wrong with this?
struct MapView: UIViewRepresentable {
#Binding var point: CLLocationCoordinate2D
func makeUIView(context: Context) -> MKMapView {
let mapView = MKMapView()
mapView.showsBuildings = true
mapView.delegate = context.coordinator
return mapView
}
func updateUIView(_ uiView: MKMapView, context: Context) {
// uiView.setCenter(point, animated: true)
}
func makeCoordinator() -> MapView.Coordinator {
Coordinator(self)
}
class Coordinator: NSObject, MKMapViewDelegate {
var parent: MapView
init(_ parent: MapView) {
self.parent = parent
}
func mapViewDidChangeVisibleRegion(_ mapView: MKMapView) {
self.parent.point = mapView.centerCoordinate
}
}
}
I tried wrapping everything into DispatchQueue.main.async {} - not working (and honestly I don't think it could)
I also tried this solution, but it worked neither: https://www.reddit.com/r/SwiftUI/comments/kti9r9/uiviewrepresentable_how_to_update_bindings/

Answer 1

I also had the same problem. I solved this using #state. So every time the mapView changes, the corresponding function of the coordinator is definitely called. Hope it helps.
struct YourView: View {
#State mapView: MKMapView = .init()
#State var point: CLLocationCoordinate2D = [...]
var body: some View {
MapView(mapView: $mapView, point: $point)
...
}
struct MapView: UIViewRepresentable {
#Binding var mapView: MKMapView
#Binding var point: CLLocationCoordinate2D
func makeUIView(context: Context) -> MKMapView {
self.mapView = MKMapView()
self.mapView.showsBuildings = true
self.mapView.delegate = context.coordinator
return self.mapView
}
...
func updateUIView(_ uiView: MKMapView, context: Context) {
// uiView.setCenter(point, animated: true)
}
func makeCoordinator() -> MapView.Coordinator {
Coordinator(self)
}
class Coordinator: NSObject, MKMapViewDelegate {
var parent: MapView
init(_ parent: MapView) {
self.parent = parent
}
func mapViewDidChangeVisibleRegion(_ mapView: MKMapView) {
self.parent.point = self.mapView.centerCoordinate
}
}
}