苹果手表SwiftUI地图事件？如何读取数字树冠旋转的当前区域跨度？

import SwiftUI
import MapKit

struct MapView: UIViewRepresentable {
    @Binding var region: MKCoordinateRegion
    
    func makeUIView(context: Context) -> MKMapView {
        let mapView = MKMapView()
        mapView.delegate = context.coordinator
        return mapView
    }
    
    func updateUIView(_ view: MKMapView, context: Context) {
        view.setRegion(region, animated: true)
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    class Coordinator: NSObject, MKMapViewDelegate {
        var parent: MapView
        
        init(_ parent: MapView) {
            self.parent = parent
        }
        
        func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
            let span = mapView.region.span
            let latitudeDelta = span.latitudeDelta
            let longitudeDelta = span.longitudeDelta
            
            // 在这里可以获取到当前地图区域的纬度和经度跨度的数值
            print("当前地图区域的纬度跨度：\(latitudeDelta)")
            print("当前地图区域的经度跨度：\(longitudeDelta)")
        }
    }
}

struct ContentView: View {
    @State private var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: 37.331516, longitude: -122.030028), span: MKCoordinateSpan(latitudeDelta: 0.2, longitudeDelta: 0.2))
    
    var body: some View {
        MapView(region: $region)
    }
}

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