如何在SwiftUI应用中保存和加载ARWorldMap？

import ARKit
import SwiftUI

func saveWorldMap(_ worldMap: ARWorldMap) {
    do {
        let data = try NSKeyedArchiver.archivedData(withRootObject: worldMap, requiringSecureCoding: true)
        UserDefaults.standard.set(data, forKey: "ARWorldMap")
    } catch {
        print("Failed to save world map: \(error)")
    }
}

func loadWorldMap() -> ARWorldMap? {
    guard let data = UserDefaults.standard.data(forKey: "ARWorldMap") else { return nil }
    do {
        let worldMap = try NSKeyedUnarchiver.unarchivedObject(ofClass: ARWorldMap.self, from: data)
        return worldMap
    } catch {
        print("Failed to load world map: \(error)")
        return nil
    }
}

struct ContentView: View {
    @State private var arView = ARView(frame: .zero)
    
    var body: some View {
        VStack {
            arView
                .edgesIgnoringSafeArea(.all)
            
            Button("Save World Map") {
                if let worldMap = arView.session.currentFrame?.worldMappingStatus == .mapped ? arView.session.currentFrame?.worldMap : nil {
                    saveWorldMap(worldMap)
                }
            }
            
            Button("Load World Map") {
                if let worldMap = loadWorldMap() {
                    let configuration = ARWorldTrackingConfiguration()
                    configuration.initialWorldMap = worldMap
                    arView.session.run(configuration, options: [.resetTracking, .removeExistingAnchors])
                }
            }
        }
    }
}