How do I get Firebase database value into UILabel text? - ios

Question

I'm trying to read a value from my Firebase database. I then want to change UILabel text to the database child value. Seems pretty simple, but I cannot figure out why the value is reading blank.
Here is my Firebase JSON:
{
"pilots" : {
"HpPzn0XUqMgsKhUOpH75lHIhyFA3" : {
"pilot" : "First Lastname",
"weight" : 180
}
}
}
Here are the Firebase rules, just for testing at the moment:
{
"rules": {
"pilots": {
".read": true,
".write": true
}
}
}
Finally the Swift 3 code, which is probably ugly as sin. First app after reading and online lessons.
import UIKit
import Firebase
import FirebaseCore
import FirebaseAuth
import FirebaseDatabase
class MainMenuViewController: UIViewController {
#IBOutlet weak var pilotUsername: UILabel!
#IBOutlet weak var dateTime: UILabel!
#IBOutlet weak var aircraftLabel: UILabel!
#IBOutlet weak var riskScoreInt: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let ref = FIRDatabase.database().reference()
let userID = FIRAuth.auth()?.currentUser?.uid
ref.child("pilots").child(userID!).child("pilot").observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
let username = value?["username"] as? String ?? ""
self.pilotUsername.text = username
print(username)
// ...
}) { (error) in
print(error.localizedDescription)
}
}
}
I'm just using the example code from the Firebase documentation. There's a line of code (in the example) after
let username = value?["username"] as? String ?? ""
that is :
let user = User.init(username: username)
but it gives me an error. "Use of unresolved identifier 'User'"
I don't think I need that line of code, since nothing like it is used in the examples and lessons that I've folowed.
Thank's in advance. This is my first time posting to Stack Overflow.

Answer 1

import FirebaseDatabase
class User {
// MARK: Properties
var firstname: String
var lastname: String
var username: String { return "\(firstname)\(lastname)" }
// MARK: Initializers
init(firstname: String, lastname: String) {
self.firstname = firstname
self.lastname = lastname
}
init?(snapshot: FIRDataSnapshot) {
guard
let firstname = snapshot.childSnapshot(forPath: "First").value as? String,
let lastname = snapshot.childSnapshot(forPath: "Lastname").value as? String
else { return nil }
self.firstname = firstname
self.lastname = lastname
}
}
Then
ref.child("pilots").child(userID!).child("pilot").observeSingleEvent(of: .value, with: { [weak self] (snapshot) in
if let user = User(snapshot: snapshot) {
self?.pilotUsername.text = user.username
}
}) { (error) in
print(error.localizedDescription)
}