Add a Spinner while all annotations are being added in Mapkit

Hi everyone. This might be a silly question, but I'm new at swift.

I have the following piece of code that I call mapView that loads a map with data from a url json .

Code Block 
import SwiftUI
import MapKit
import Combine
var locationsFillTest : Int = 0
var allLocations = [MKPointAnnotation]()
var doneGettingData : Bool = false {
    didSet {
        if doneGettingData {
            print("The instance property doneGettingData is now true.")
        } else {
            print("The instance property doneGettingData is now false.")
        }
    }
}
struct MapView: UIViewRepresentable {
   
    var startdate : String
    var depth: String
   func makeUIView(context: Context) -> MKMapView{
         MKMapView(frame: .zero)
          }   
   func makeCoordinator() -> MapViewCoordinator{
        MapViewCoordinator(self)
    }
    
   func updateUIView(_ uiView: MKMapView, context: Context){
 
    uiView.removeAnnotations(allLocations)
    allLocations = []
    doneGettingData = false
    
    let url = URL(string: "https://xxxx.com")!
    
    URLSession.shared.dataTask(with: url) {(data,response,error) in
            do {
                if let d = data {
                    let decodedLists = try JSONDecoder().decode(emsc.self, from: d)
                    DispatchQueue.main.async {
                        locationsFillTest = allLocations.count
                        for locations in decodedLists.features {
                            var mapRegion = MKCoordinateRegion()
                            let mapRegionSpan = 24.0
                            mapRegion.span.latitudeDelta = mapRegionSpan
                            mapRegion.span.longitudeDelta = mapRegionSpan
                            let lat = Double(locations.properties.lat)
                            let long = Double(locations.properties.lon
                            let annotation = MKPointAnnotation()
                            annotation.coordinate = CLLocationCoordinate2D(latitude: lat , longitude: long )
                        uiView.addAnnotations(allLocations)
                        uiView.delegate = context.coordinator
                        uiView.showAnnotations(uiView.annotations, animated: true)
                        doneGettingData = true
                    }
            } catch {
                print("Error decoding JSON: ", error, response!)
            }
        }.resume()
    
    }
    
}
struct MapView_Previews: PreviewProvider {
    static var previews: some View {
        MapView(startdate: "2020-08-23",depth: "All")
    }
}

so far so good the points get to the map, and the variable doneGettingData does change from false too true when all the points are loaded.
But now I would like to use this variable to set a spinner in my contentView, the issue is that although the variable its available and I can see it changing in the print statement it does not change in the contentView, I have tested with a Text so I could checked it.
Any ideias please ?
Thank you