My TableView is not populating with my custom cell - ios

Question

I am trying to populate my tableView with a custom cell but whenever I run my app, the tableView always appears empty. Is there anything wrong with my code? I checked the identifiers and everything is correct. I also checked all the variables to see if they were nil but none of them were.
import UIKit
import Firebase
class StatisticsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
var userArray : [UserString] = [UserString]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
tableView.delegate = self
tableView.dataSource = self
tableView.register(UINib(nibName: "DataCell", bundle: nil), forCellReuseIdentifier: "customMessageCell")
configureTableView()
loadInformation()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return userArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "customMessageCell", for: indexPath) as! CustomTableViewCell
cell.heightLabel.text = "Height - " + userArray[indexPath.row].height
cell.weightLabel.text = "Weight - " + userArray[indexPath.row].weight
return cell
}
func loadInformation(){
let messageDB = Database.database().reference().child("Users")
messageDB.observe(.childAdded) { (snapshot) in
let snapshotValue = snapshot.value as! Dictionary<String,String>
let email = snapshotValue["UserEmail"]!
if (email == Auth.auth().currentUser?.email as String?){
let user : UserString = UserString()
user.name = snapshotValue["UserName"]!
user.height = snapshotValue["UserHeight"]! + " cm"
user.weight = snapshotValue["UserWeight"]! + " kg"
user.date = snapshotValue["EntryDate"]!
self.userArray.append(user)
self.configureTableView()
self.tableView.reloadData()
}
}
}
func configureTableView(){
tableView.rowHeight = UITableView.automaticDimension
tableView.estimatedRowHeight = 120.0
}
}

Answer 1

Try with static height I think there is constraints related problem in your cell that's why UITableViewAutomaticDimension not Working Try This with static height if it works then look over cell constraints.
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100.0
}

Answer 2

Try by changing hierarchy of statements first register nib and then call delegate and dataSource Also check data is not empty.
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(UINib(nibName: "DataCell", bundle: nil), forCellReuseIdentifier: "customMessageCell")
tableView.delegate = self
tableView.dataSource = self
// Do any additional setup after loading the view.
configureTableView()
loadInformation()
}