Label in tableview cell not showing up - ios

Question

I am creating a tableview with one cell, and retrieving data from Firebase to display as a label firstName. The data is being retrieved (I have checked by using a print statement) however the label is not showing up, even though alpha is set to 1. Any help would be much appreciated.
Here is my code:
import FirebaseDatabase
import FirebaseStorage
import FirebaseAuth
import SwiftKeychainWrapper
class userTableViewController: UITableViewController {
var profileData = [profileStruct]()
let storageRef = Storage.storage().reference()
var databaseRef = Database.database().reference()
var ref: DatabaseReference?
var firstName = ""
var lastName = ""
var email = ""
var phoneNumber = ""
override func viewDidLoad() {
super.viewDidLoad()
getProfile()
// Do any additional setup after loading the view.
// tableView.register(profileCell.self, forCellReuseIdentifier: "ProfileCell")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
struct profileStruct {
let email : String!
let phoneNumber : String!
let firstName : String!
let lastName : String!
}
#IBAction func signOut(_ sender: Any) {
KeychainWrapper.standard.removeObject(forKey: "uid")
do {
try Auth.auth().signOut()
} catch let signOutError as NSError {
print ("Error signing out: %#", signOutError)
}
dismiss(animated: true, completion: nil)
}
func getProfile() {
let databaseRef = Database.database().reference()
databaseRef.child("users").queryOrderedByKey().observeSingleEvent(of: .childAdded, with: {
snapshot in
self.firstName = ((snapshot.value as? NSDictionary)!["firstname"] as? String)!
self.lastName = ((snapshot.value as? NSDictionary)!["lastname"] as? String)!
self.email = ((snapshot.value as? NSDictionary)!["email"] as? String)!
self.phoneNumber = ((snapshot.value as? NSDictionary)!["phone number"] as? String)!
print(self.firstName)
DispatchQueue.main.async {
self.tableView.reloadData()
}
})
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
// tableView.dequeueReusableCell(withIdentifier: "PostCell")!.frame.size.height
return 500
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "ProfileCell") as? profileCell else { return UITableViewCell() }
cell.firstNameLabel?.text = "first name: " + firstName
cell.lastNameLabel?.text = "last name: " + lastName
cell.emailLabel?.text = "email: " + email
cell.phoneNumberLabel?.text = "phone number: " + phoneNumber
return cell
}
}

Answer 1

Add a breakpoint on guard let cell = tableView.dequeueReusableCell(withIdentifier: "ProfileCell") as? profileCell else { return UITableViewCell() }, you need to check whether the as? profileCell is successful, and check whether the Data Source is invoked.
If the first step is working, you need to check the profileCell UI layout. Open the Debug View Hierarchy, and check whether any cell on tableView.

Answer 2

func getProfile() {
let databaseRef = Database.database().reference()
databaseRef.child("users").queryOrderedByKey().observeSingleEvent(of: .childAdded, with: {
snapshot in
self.firstName = ((snapshot.value as? NSDictionary)!["firstname"] as? String)!
self.lastName = ((snapshot.value as? NSDictionary)!["lastname"] as? String)!
self.email = ((snapshot.value as? NSDictionary)!["email"] as? String)!
self.phoneNumber = ((snapshot.value as? NSDictionary)!["phone number"] as? String)!
print(self.firstName)
self.tableView.dataSource = self
self.tableView.delegate = self
self.tableView.reloadData()
})}

Answer 3

You seem to show the email instead of the first name here.
cell.emailLabel?.text = "email: " + firstName
cell.phoneNumberLabel?.text = "phone number: " + lastName
cell.firstNameLabel?.text = "first name: " + email
cell.lastNameLabel?.text = "last name: " + phoneNumber