将Firestore文档中的数组映射到SwiftUI应用程序中的Swift结构

import Firebase
import FirebaseFirestore

FirebaseApp.configure()
let db = Firestore.firestore()

struct Item: Identifiable {
    let id: String
    let name: String
    let price: Double
}

func fetchItems() {
    db.collection("items").document("documentID").getDocument { (snapshot, error) in
        if let error = error {
            print("Error fetching document: \(error)")
            return
        }
        
        if let data = snapshot?.data() {
            // 解析数据并映射到Swift结构体
            let items = parseItems(data: data)
            
            // 使用映射后的数据更新UI
            DispatchQueue.main.async {
                self.items = items
            }
        }
    }
}

func parseItems(data: [String: Any]) -> [Item] {
    var items: [Item] = []
    
    if let array = data["arrayField"] as? [[String: Any]] {
        for itemData in array {
            if let id = itemData["id"] as? String,
               let name = itemData["name"] as? String,
               let price = itemData["price"] as? Double {
                let item = Item(id: id, name: name, price: price)
                items.append(item)
            }
        }
    }
    
    return items
}

struct ContentView: View {
    @State private var items: [Item] = []
    
    var body: some View {
        List(items) { item in
            Text(item.name)
            Text("\(item.price)")
        }
        .onAppear {
            fetchItems()
        }
    }
}