Displaying Username in Swift and FireBase - swift

Question

I'm trying to display the users username that stored in firebase. I'm not sure if Im saving the username correctly or if that's even the problem. I can't seem to access the data or display it at all. Any tips? I have a screenshot of the Cloud Firestore attached.
SignupViewController
import UIKit
import FirebaseAuth
import Firebase
import AVKit
import FirebaseFirestore
class SignUpViewController: UIViewController {
var videoPlayer:AVPlayer?
var videoPlayerLayer:AVPlayerLayer?
#IBOutlet weak var firstNameTextField: UITextField!
#IBOutlet weak var lastNameTextField: UITextField!
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
#IBOutlet weak var BackButton: UIButton!
#IBOutlet weak var UserNameTextField: UITextField!
#IBOutlet weak var signUpButton: UIButton!
#IBOutlet weak var errorLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
let tap = UITapGestureRecognizer(target: view, action: #selector(UIView.endEditing))
view.addGestureRecognizer(tap)
// Do any additional setup after loading the view.
setupElements()
}
func setupElements(){
//hides the error label
errorLabel.alpha = 0
//styles the text and buttons
Utilities.styleTextField(UserNameTextField)
Utilities.styleTextField(firstNameTextField)
Utilities.styleTextField(lastNameTextField)
Utilities.styleTextField(passwordTextField)
Utilities.styleTextField(emailTextField)
Utilities.styleFilledButton(signUpButton)
}
/*
// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
}
*/
// this function makes sure all data is good
func validateFields() -> String?
{
//make sure fields are filled
if firstNameTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == "" || lastNameTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == "" || emailTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == "" || UserNameTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == ""
{
return "Please fill all fields"
}
let cleanPassword = passwordTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
if Utilities.isPasswordValid(cleanPassword) == false{
return "Needs 8 charaters, number, and special charater"
}
return nil
}
#IBAction func signUpTapped(_ sender: Any) {
//validate fields
let error = validateFields()
if error != nil{
showError(error!)
}
else{
let firstName = firstNameTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
let lastName = lastNameTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
let email = emailTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
let password = passwordTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
let username = UserNameTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
//create user
Auth.auth().createUser(withEmail: email, password: password) { result, err in
if err != nil{
self.showError("Error creating user")
}
else
{
//User is stored sucessfully, store the first and last name
let database = Firestore.firestore()
database.collection("UserInfo").addDocument(data: ["firstname": firstName,"email": email, "lastname": lastName, "username": username, "uid": result!.user.uid]) {(error) in
if error != nil
{
self.showError("First name and last name couldnt be saved.")
}
}
self.transitionToHome()
}
}
}
}
func showError(_ message:String){
errorLabel.text = message
errorLabel.alpha = 1
}
func transitionToHome(){
let homeViewController = storyboard?.instantiateViewController(identifier: Constants.StoryBoard.homeViewController) as?
HomeViewController
view.window?.rootViewController = homeViewController
view.window?.makeKeyAndVisible()
}
override func viewWillAppear(_ animated: Bool) {
//Set up video in background
setUpVideo()
}
func setUpVideo(){
//Get path to resource bundle
let bundlePath = Bundle.main.path(forResource: "IMG_7211 2", ofType: "mov")
guard bundlePath != nil else{
return
}
//create the url from it
let url = URL(fileURLWithPath: bundlePath!)
//Create The video Player item
let item = AVPlayerItem(url: url)
//create the player
videoPlayer = AVPlayer(playerItem: item)
//create the layer
videoPlayerLayer = AVPlayerLayer(player: videoPlayer!)
//adjust the size and frame
videoPlayerLayer?.frame = CGRect(x: -self.view.frame.size.width*1.5, y:0, width: self.view.frame.size.width*4, height: self.view.frame.size.height)
view.layer.insertSublayer(videoPlayerLayer!, at: 0)
//add and play
videoPlayer?.playImmediately(atRate: 0.8)
}
}
CurrentUser.swift
import Foundation
struct CurrentUser{
let uid: String
let name: String
let email: String
let profilepictureURL:String
init(uid: String, dictionary: [String: Any]){
self.uid = uid
self.name = dictionary["username"] as? String ?? ""
self.email = dictionary["email"] as? String ?? ""
self.profilepictureURL = dictionary["profilepictureURL"] as? String ?? ""
}
}
ProfileViewController
import UIKit
import Firebase
import FirebaseAuth
import FirebaseInstallations
import FirebaseFirestore
import FirebaseStorage
import FirebaseDatabase
class ProfileViewController: UIViewController {
#IBOutlet weak var SignOut: UIButton!
#IBOutlet weak var UserName: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
UserNameLabel()
// Do any additional setup after loading the view.
}
func UserNameLabel()
{
if Auth.auth().currentUser != nil
{
guard let uid = Auth.auth().currentUser?.uid else {return}
Database.database().reference().child("users").child(uid).observeSingleEvent(of: .value) { (snapshot) in
guard let dict = snapshot.value as? [String: Any] else {return}
let user = CurrentUser(uid: uid, dictionary: dict)
self.UserName.text = user.username
}
}
}
#IBAction func SignOut(_ sender: Any) {
if Auth.auth().currentUser != nil {
do {
try Auth.auth().signOut()
let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Vc")
vc.modalPresentationStyle = .fullScreen
present(vc, animated: true, completion: nil)
}
catch let error as NSError {
print(error.localizedDescription)
}
}
}
}

Answer 1

The problem is you are saving the data to Firebase Firestore, and then trying to access it from firebase real time database. Firebase Realtime Database and Firebase Firestore are 2 completely different backend servers and you are trying to use both at the same time. You need to pick only 1 and stick with it.
You are saving it to firebase firestore by using:
let database = Firestore.firestore()
database.collection("UserInfo").addDocument()
then after you save it to firestore you are trying to access it from real time database, not Firestore which is causing it to return nil:
Database.database().reference().child("users").child(uid).observeSingleEvent(of: .value) { (snapshot) in
So instead what you need to do is get it back from firestore by using this:
Firestore.firestore().collection("s").getDocuments { query, error in
for doc in query!.documents {
// Successfully retrieved data from firestore.
}
}
Note: You could also instead save it to the real time database instead of firestore, but it just depends which one will work better for your app. You need to pick either Firestore or the Database, you can't use both. Here is more info to help you decide which one is better. More Info