不知道如何在SwiftUI (Xcode12.4)中打开地图

import MapKit

struct ContentView: View {
    var body: some View {
        MapView()
            .edgesIgnoringSafeArea(.all)
    }
}

struct MapView: UIViewRepresentable {
    func makeUIView(context: Context) -> MKMapView {
        MKMapView()
    }
    
    func updateUIView(_ uiView: MKMapView, context: Context) {
        let coordinate = CLLocationCoordinate2D(latitude: 37.331516, longitude: -122.030028)
        let span = MKCoordinateSpan(latitudeDelta: 0.2, longitudeDelta: 0.2)
        let region = MKCoordinateRegion(center: coordinate, span: span)
        uiView.setRegion(region, animated: true)
        
        let annotation = MKPointAnnotation()
        annotation.coordinate = coordinate
        annotation.title = "Apple Park"
        annotation.subtitle = "Cupertino, CA"
        uiView.addAnnotation(annotation)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}