The default app has not been configured yet

Question

I\'m trying to upgrade my app to the new version of Firebase. I went through the setup guide and edited all of my code to match the new syntax. However, when I run the app,

Answer 1

In AppDelegate.m, outside of didFinishLaunchingWithOptions,

override init() {
   FIRApp.configure()
   FIRDatabase.database().persistenceEnabled = true
}

Answer 2

iOS 9.2
Swift 2.1.1
Xcode 7.2.1
Mac OSX 10.10.5

Same error here using the following code:

AppDelegate.swift:

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.

        FIRApp.configure()


        return true
    }

ViewController.swift:

import UIKit
import Firebase

class ViewController: UIViewController {


    var db = FIRDatabase.database().reference()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        //Create some data in Firebase db:
        db.child("key").child("subkey").setValue("hello world")

    }

I also added the file GoogleService-Info.plist to my project directory as described in the Firebase Getting Started Guide.

And I made my Firebase db public with the following Rules:

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

Making the following changes to ViewController.swift is what worked for me:

class ViewController: UIViewController {


    var db: FIRDatabaseReference!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        db = FIRDatabase.database().reference()
        db.child("key").child("subkey").setValue("hello world")

    }

Prior to running my app, my Firebase db looked like this:

myiosdata-abc123: null

After running my app, my Firebase db looked like this:

myiosdata-abc123
- key
   |
   +--- subkey: “hello world”

Answer 3

Swift 5 - Easy Solution

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

return true
}


//MARK:- This function will auto run and firebase will configure successfully
override init() {
    super.init()
        FirebaseApp.configure()
        // not really needed unless you really need it 
        FIRDatabase.database().persistenceEnabled = true
}

Happy Coding