如何让 Firestore 数据显示在标签中

Question

我是编码新手，请多多包涵。我将视图控制器中的代码设置为加载到视图控制器上的标签中。当代码在模拟器上运行时，它会在控制台中正确打印并显示文档 ID、名字和姓氏，但不会将名字和姓氏放在视图控制器上的标签中。我错过了什么？

import UIKit
import FirebaseDatabase
import Firebase
import FirebaseFirestore
import FirebaseAuth

class profileViewController: UIViewController {
    
    
    @IBOutlet var firstNameLabel: UILabel!
    @IBOutlet var lastNameLabel: UILabel!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        readArray()
    }
    
    let userID = Auth.auth().currentUser?.uid
    let db = Firestore.firestore()
    
    func readArray() {
        self.db.collection("users").getDocuments { (snapshot, err) in
            if let err = err {
                print("Error getting documents: \(err)")
            } else {
                for document in snapshot!.documents {
                    let docId = document.documentID
                    let firstNameLabel = document.get("firstname") as! String
                    let lastNameLabel = document.get("lastname") as! String
                    print(docId, firstNameLabel, lastNameLabel)
                }
            }
        }
    }
}

Answer 1

根据您的示例代码，缺少这些代码。 :)

firstNameLabel.text = firstNameLabel
lastNameLabel.text = lastNameLabel