FirebaseApp.configure() has an error use of unresolved identifier 'FirebaseApp'

Question

So every time in my pod file I decide to add something like pod 'Firebase/Storage’ with pod 'Firebase/Core’, in my app delicate FirebaseApp.configure() has an error use of unresolved identifier 'FirebaseApp' my pod file is

https://docs.google.com/document/d/1U7s5StRuNrI_2WtpHSvHhwhA1TMCsQ255dnjDAEhhcE/edit?usp=sharing

Solution 1

I solved this problem by using FirebaseCore instead of Firebase library:

import FirebaseCore

Solution 2

Your appdelegate class should look like this:

import UIKit
import Firebase

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

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

    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }
}

I am assuming you are using xcode 8 and swift 3.

Solution 3

In my case was because I was using an older version of Firebase (3.11.1)

pod repo update
pod update

After update my repo and my local specs repositories with Firebase (4.2.0) FirebaseApp was resolved by Xcode!

Solution 4

Run pod update to at least Firebase 6.31.1.

Firebase made a change in 6.28.0 that exposed an Xcode build race condition. The change was reverted in 6.31.1. Details at https://github.com/firebase/firebase-ios-sdk/issues/6341

Solution 5

Try pod 'Firebase' instead of pod 'Firebase/Core'

And check if Firebase 4.x was installed after 'pod install'

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