Authenticate with Firebase on Apple Platforms Using a Custom Authentication System

You can integrate Firebase Authentication with a custom authentication system by modifying your authentication server to produce custom signed tokens when a user successfully signs in. Your app receives this token and uses it to authenticate with Firebase.

Before you begin

1. Create a Firebase project and register your app if you haven't already.

2. Use Swift Package Manager to install and manage Firebase dependencies.

   1. In Xcode, with your app project open, navigate to File > Add Packages .
   2. When prompted, add the Firebase Apple platforms SDK repository:

   https://github.com/firebase/firebase-ios-sdk.git

   3. Choose the Firebase Authentication library.
   4. Add the -ObjC flag to the Other Linker Flags section of your target's build settings.
   5. When finished, Xcode will automatically begin resolving and downloading your dependencies in the background.
3. Get your project's server keys:
   1. Go to the Service Accounts page in your project's settings.
   2. Click Generate New Private Key at the bottom of the Firebase Admin SDK section of the Service Accounts page.
   3. The new service account's public/private key pair is automatically saved on your computer. Copy this file to your authentication server.

Authenticate with Firebase

1. Import the FirebaseCore module in your UIApplicationDelegate , as well as any other Firebase modules your app delegate uses. For example, to use Cloud Firestore and Authentication :

   SwiftUI

    import 
     
    SwiftUI 
    import 
     
    FirebaseCore 
    import 
     
    FirebaseFirestore 
    import 
     
    FirebaseAuth 
    // ... 
     
   

   Swift

    import 
     
    FirebaseCore 
    import 
     
    FirebaseFirestore 
    import 
     
    FirebaseAuth 
    // ... 
     
   

   Objective-C

    @import 
     
    FirebaseCore 
    ; 
    @import 
     
    FirebaseFirestore 
    ; 
    @import 
     
    FirebaseAuth 
    ; 
    // ... 
     
   

2. Configure a FirebaseApp shared instance in your app delegate's application(_:didFinishLaunchingWithOptions:) method:

   SwiftUI

    // Use Firebase library to configure APIs 
    FirebaseApp 
    . 
    configure 
    () 
   

   Swift

    // Use Firebase library to configure APIs 
    FirebaseApp 
    . 
    configure 
    () 
   

   Objective-C

    // Use Firebase library to configure APIs 
    [ 
    FIRApp 
     
    configure 
    ]; 
   

3. If you're using SwiftUI, you must create an application delegate and attach it to your App struct via UIApplicationDelegateAdaptor or NSApplicationDelegateAdaptor . You must also disable app delegate swizzling. For more information, see the SwiftUI instructions .

   SwiftUI

    @ 
    main 
    struct 
     
    YourApp 
    : 
     
    App 
     
    { 
     
    // register app delegate for Firebase setup 
     
    @ 
    UIApplicationDelegateAdaptor 
    ( 
    AppDelegate 
    . 
    self 
    ) 
     
    var 
     
    delegate 
     
    var 
     
    body 
    : 
     
    some 
     
    Scene 
     
    { 
     
    WindowGroup 
     
    { 
     
    NavigationView 
     
    { 
     
    ContentView 
    () 
     
    } 
     
    } 
     
    } 
    } 
     
   

4. When users sign in to your app, send their sign-in credentials (for example, their username and password) to your authentication server. Your server checks the credentials and returns a custom token if they are valid.
5. After you receive the custom token from your authentication server, pass it to signInWithCustomToken to sign in the user:

   Swift

    Auth 
    . 
    auth 
    (). 
    signIn 
    ( 
    withCustomToken 
    : 
     
    customToken 
     
    ?? 
     
    "" 
    ) 
     
    { 
     
    user 
    , 
     
    error 
     
    in 
     
    // ... 
    } 
   

   Objective-C

    [[ 
    FIRAuth 
     
    auth 
    ] 
     
    signInWithCustomToken 
    : 
    customToken 
     
    completion 
    : 
    ^ 
    ( 
    FIRAuthDataResult 
     
    * 
     
    _Nullable 
     
    authResult 
    , 
     
    NSError 
     
    * 
     
    _Nullable 
     
    error 
    ) 
     
    { 
     
    // ... 
    }]; 
   

Next steps

After a user signs in for the first time, a new user account is created and linked to the credentials—that is, the user name and password, phone number, or auth provider information—the user signed in with. This new account is stored as part of your Firebase project, and can be used to identify a user across every app in your project, regardless of how the user signs in.

• In your apps, you can get the user's basic profile information from the User object. See Manage Users .

• In your Firebase Realtime Database and Cloud Storage Security Rules , you can get the signed-in user's unique user ID from the auth variable, and use it to control what data a user can access.

You can allow users to sign in to your app using multiple authentication providers by linking auth provider credentials to an existing user account.

To sign out a user, call signOut: .

 let 
  
 firebaseAuth 
  
 = 
  
 Auth 
 . 
 auth 
 () 
 do 
  
 { 
  
 try 
  
 firebaseAuth 
 . 
 signOut 
 () 
 } 
  
 catch 
  
 let 
  
 signOutError 
  
 as 
  
 NSError 
  
 { 
  
 print 
 ( 
 "Error signing out: %@" 
 , 
  
 signOutError 
 ) 
 } 

 NSError 
  
 * 
 signOutError 
 ; 
 BOOL 
  
 status 
  
 = 
  
 [[ 
 FIRAuth 
  
 auth 
 ] 
  
 signOut 
 : 
& signOutError 
 ]; 
 if 
  
 ( 
 ! 
 status 
 ) 
  
 { 
  
 NSLog 
 ( 
 @"Error signing out: %@" 
 , 
  
 signOutError 
 ); 
  
 return 
 ; 
 } 

You may also want to add error handling code for the full range of authentication errors. See Handle Errors .