如何在Swift中访问云FireStore Firebase中的特定字段

import Firebase
import FirebaseFirestore

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

let docRef = db.collection("yourCollection").document("yourDocument")

docRef.getDocument { (document, error) in
    if let document = document, document.exists {
        let dataDescription = document.data().map(String.init(describing:)) ?? "nil"
        print("Document data: \(dataDescription)")
        
        if let specificField = document.data()?["specificField"] as? String {
            // 访问特定字段
            print("Specific field value: \(specificField)")
        } else {
            print("Specific field does not exist or is not of type String")
        }
    } else {
        print("Document does not exist")
    }
}