App crashing when using Firebase Auth, reason: 'Default app has already been configured.'

Question

I\'m building my first iOS application, and I am using Firebase to handle authentication, database, etc. I added a sign up screen and used the following code to create a new

Answer 1

This is other solution about this issue. 1/ Check in the "AppDelegate.swift" we will see as below

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    FirebaseApp.configure()
    return true
}

2/ Remove "FirebaseApp.configure()" from above code to

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

    return true
}

3/ Add below code into "AppDelegate.swift"

override init() {
    FirebaseApp.configure()
}

4/ Go to "ViewController.swift" and add the code

    if FirebaseApp.app() == nil {
        FirebaseApp.configure()
    }

5/ Build again and Run it's will work. Thanks!