VoteControllerFixed.swift

import UIKit
import Firebase

class VoteController: UIViewController {
    
    //MARK: Global Variables
    var ref: DatabaseReference?
    var songs = [Song]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //Check if user is signed into Firebase
        if let uid = Auth.auth().currentUser?.uid {
            ref = Database.database().reference()
        }
        fetchData {
            print(self.songs)
        }
        
    }
    
    func fetchData(completed: @escaping ()->()) {
        self.ref?.child("songs").observe(.value, with: { (snapshot) in
            
            print(snapshot)
            
            //Cast Firebase data snapshot as dictionary
            if let dictionary = snapshot.value as? [String: AnyObject] {
                
                for (key, value) in dictionary {
                    let song = Song()
                    var ratio: String?
                    
                    
                    song.name = key as! String
                    song.elo = value["elo"] as! Int
                    song.wins = value["wins"] as! Int
                    song.losses = value ["losses"] as! Int
                    print(song.name!, song.elo!, song.wins!, song.losses!)
                    

                    self.songs.append(song)
                    
                }
            }
            completed()
        })
    }
    
}
}