This is what happens: running on Xcode Version 7.3.1 (7D1014) pod 'Firebase/Core' import Firebase in the Class unresolved on Database Then I added the Database framework pod 'Firebase/Core' pod 'Firebase/Database' unresolved on FirebaseApp It seems that the 2 frameworks are in mutex mode. They cannot coexist. I have tried everything: update, install, uninstall, recreate the project, recreate the workspace. All. May you help me. Is there a bug on last Firebase release?

This is probably too late but if you are sure your podfile is correct and your app has been building before. When this error just comes out of the blue, remember that the other thing can go wrong is your Xcode's incremental build folder.

Try this:

Quite Xcode
Locate your Build folder and DerivedData folder in finder
Delete Build folder and DerivedData folder
Rebuild via Xcode

Hopefully you'd be fine then.

Upvotes: 1

Dan Burkhardt

Reputation: 21

import FirebaseCore

Adding this to the top of the class resolved the issue for me.

FirebaseCore version: 6.29.0

Upvotes: 1

Likhit Garimella

Reputation: 306

In my case it I needed to import FirebaseCore instead of import Firebase or import FirebaseRemoteConfig.

Upvotes: 4

Alexander Telegin

Reputation: 714

For those facing the issue with RemoteConfig configuration, adding an extra import:

import FirebaseRemoteConfig

helped in my case

Upvotes: 1

Dilip Saket

Reputation: 96

Use FIRApp.configure() instead of FirebaseApp.

Upvotes: 1

Niraj

Reputation: 1964

I had a similar issue.

Your import statement would be:

import Firebase

Make sure restart Xcode and to clean the build folder.

It's working for me & got rid of "Use of unresolved identifier FirebaseApp..." error

Update: For Swift 4.2: FirebaseApp.configure() does work. [FIRApp is renamed to FirebaseApp]

Upvotes: 78

Florian

Reputation: 11

It worked for me with

pod repo update
pod update

and then run this at the location of the pod file:

pod install

After rebuilding my app the error should be gone.

Upvotes: 1

ztredded

Reputation: 69

I put in 'Firebase' along w/ 'Firebase/Core' in the podfile and it worked for me

Upvotes: 2

sonnet

Reputation: 567

import FirebaseCore

Then you could use FirebaseApp.configure(). I'm using swift 4.

Upvotes: 50

Steffen

Reputation: 161

That work today for me:

1. in Xcode 9.1

import UIKit
import Firebase
import UserNotifications
import FirebaseInstanceID
import FirebaseMessaging
import FirebaseCrash
import FirebaseAnalytics


@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


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

        FirebaseApp.configure()

        return true
    }

2. My PodFile

pod 'Firebase'
  pod 'Firebase/Core'
  pod 'Firebase/Database'
  pod 'Firebase/Crash'
  pod 'Firebase/RemoteConfig'
  pod 'Firebase/Storage'
  pod 'FirebaseUI', '~> 4.0'
  pod 'Firebase/Auth'
  pod 'Firebase/Messaging'

3. finale: