How can I display name of User object in ProfileViewController - ios

Question

I need to display user.username on Text in ProfileView but I got error when I try to fill current user with User. I have to get User in currentUser var.
import Foundation
import FirebaseAuth
import Firebase
class AuthViewModel: ObservableObject
{
#Published var userSession: FirebaseAuth.User?
#Published var currentUser: User?
private var tempUserSession: FirebaseAuth.User?
private let service = UserService()
init()
{
self.userSession = Auth.auth().currentUser
}
func login(withEmail email: String, password: String)
{
Auth.auth().signIn(withEmail: email, password: password) { authResult, error in
if let e = error
{
print(e.localizedDescription)
}
else
{
guard let user = authResult?.user else {return}
self.userSession = user
guard let uid = self.userSession?.uid else { return }
self.service.fetchUser(withUid: uid)
print("Did User log IN")
}
}
}
func fetchUser()
{
guard let uid = self.userSession?.uid else { return }
service.fetchUser(withUid: uid) { user in <----- HERE I GOT AN ERROR Extra trailing closure passed in call
self.currentUser = user
}
}
}
import Foundation
import UIKit
import FirebaseAuth
import SwiftUI
class ProfileViewController: UIViewController
{
var authViewModel = AuthViewModel()
#IBOutlet weak var userNameLabel: UILabel!
override func viewDidLoad()
{
navigationItem.hidesBackButton = true
userNameLabel.text = authViewModel.currentUser?.username // HERE I WANT TO DISPLAY CURRENT USER - USERNAME
print(userNameLabel.text)
}
}
I tried fill currentuser with user but nothings worked. Still in profile view controller I got nill. (currentUser.username = nil)

Answer 1

The code calls fetchUser like it's an asynchronous function and it's not; it's a synchronous function that does not return a value, nor has an escaping completion handler. So that's the cause of the error.
Here's how I would do it. Start with a a simple user class
class MyUser {
var userName = ""
var uid = ""
}
and then a simplified fetchUser using async/await
func fetchUser() {
Task {
let uid = "uid_0"
let foundUser = await self.getUserAsync(withUid: "uid_0")
print(foundUser.userName)
}
}
and then the code to fetch the user from Firestore, instantiate a MyUser object and return it
func getUserAsync(withUid: String) async -> MyUser {
let usersCollection = self.db.collection("users") //self.db points to my firestore
let thisUserDoc = usersCollection.document(withUid)
let snapshot = try! await thisUserDoc.getDocument()
let user = MyUser()
user.userName = snapshot.get("userName") as? String ?? "No Name"
user.uid = withUid
return user
}