如何使用SwiftUI解码嵌套的JSON元素并在视图中显示信息？

import SwiftUI

struct ContentView: View {
    @State private var userData: UserData?
    
    var body: some View {
        VStack {
            if let userData = userData {
                List(userData.users) { user in
                    VStack(alignment: .leading) {
                        Text(user.name)
                            .font(.headline)
                        Text(user.email)
                            .font(.subheadline)
                    }
                }
            } else {
                Text("Loading...")
            }
        }
        .onAppear {
            fetchData()
        }
    }
    
    func fetchData() {
        guard let url = URL(string: "https://example.com/users.json") else {
            return
        }
        
        URLSession.shared.dataTask(with: url) { data, response, error in
            if let data = data {
                let decoder = JSONDecoder()
                if let decodedData = try? decoder.decode(UserData.self, from: data) {
                    DispatchQueue.main.async {
                        self.userData = decodedData
                    }
                }
            }
        }.resume()
    }
}

struct User: Codable, Identifiable {
    let id: Int
    let name: String
    let email: String
}

struct UserData: Codable {
    let users: [User]
}