Getting collection and saving it into array object in firestore swift - ios

Question

I'm trying to save collection into an array of objects called List, and the retrieving is been called in viewdidload by the function loadfirebase. So it actually retrieves the data from firebase and prints it but it doesn't save it in the array. I think it is something that deals with closure but not sure how to fix it.
//
// ContactList.swift
// Socket
//
// Created by dalal aljassem on 12/16/21.
//
import UIKit
import FirebaseFirestore
import FirebaseStorage
class ContactList: UIViewController, UITableViewDelegate, UITableViewDataSource {
private let storage = Storage.storage().reference()
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return List.count
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell" , for:indexPath)
var currentname = List[indexPath.row]
cell.textLabel?.text = currentname.name
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
print("some action will happen when i tap here")
}
#IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
loadfirebase()
print("**************",List)
}
}
let database = Firestore.firestore()
func loadfirebase()
{
let contactdataRef = database.collection("ContactData")
contactdataRef.getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
// var currentDoc = document.data()
print("///////////////")
// print("current doc = " , currentDoc)
print("current name = " , document.get("name")!)
print("current image = " , document.get("image")!)
List.append(Contact(name: document.get("name") as! String, image: document.get("image") as! String, number: ""))
print("\(document.documentID) => \(document.data())")
}
}
}}
}

Answer 1

Your List array is never initialized.
You can achieve this with the following code:
var List: [Contact] = []
and I would put this before the declaration of tableView function.