Database Reference Error - swift

Question

In my iOS project, I am using Firebase to create a real time database. I have already imported it in the AppDelegate.swift.
When trying to reference my database within the app, an error appears.
Any ideas on how to fix this? Here is the code:
import UIKit
import Firebase
class TableViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
post()
}
func post(){
let title = "Title"
let message = "Message"
let post : [String : AnyObject] = ["title" : title as AnyObject,
"message" : message as AnyObject]
let databaseRef = FirebaseApp.database().reference()
databaseRef.child("Posts").childByAutoId().setValue(post)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

You need to first configure firebase, example:
FirebaseApp.configure()
then you can reference to the database:
let databaseRef = Database.database().reference()
FirebaseApp does not contain a method called database()

Answer 2

If your Firebase/Database version is 4.9.0, the following should give you a good start.
import UIKit
import Firebase
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
override init() {
super.init()
FirebaseApp.configure()
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
return true
}
}
import UIKit
import FirebaseDatabase
class TableViewController: UITableViewController {
// MARK: - Instance variables
var databaseRef: DatabaseReference!
// MARK: - Life cycle
override func viewDidLoad() {
super.viewDidLoad()
//getting a reference to the node artists
databaseRef = Database.database().reference()
}
}

Answer 3

Add 'Firebase/Database' to your pods:
pod 'Firebase/Core'
pod 'Firebase/Database'
Then update the pods
pod install
Into your code be sure to import firebase
import Firebase
And use it as
FirebaseApp.configure()
var ref: DatabaseReference!
ref = Database.database().reference()
ref.setValue("Testing")
More info on Firebase help