Autenticar anonimamente com o Firebase em plataformas da Apple
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Você pode usar Firebase Authentication para criar e usar contas anônimas temporárias
e fazer a autenticação no Firebase. Com essas contas, os usuários que ainda não se registraram
no seu app podem trabalhar com os dados protegidos pelas
regras de segurança. Se um usuário anônimo se registrar no seu app,
vincule as credenciais de login à conta
anônima para que ele continue trabalhando com os dados protegidos
nas sessões futuras.
Antes de começar
Use o Swift Package Manager para instalar e gerenciar as dependências do Firebase.
No Xcode, com seu projeto do app aberto, navegue até File > Add Packages.
Quando solicitado, adicione o repositório do SDK do Firebase para as plataformas Apple:
https://github.com/firebase/firebase-ios-sdk.git
Escolha a biblioteca Firebase Authentication.
Adicione a sinalização -ObjC à seção Outras sinalizações do vinculador das configurações de compilação do destino.
Quando terminar, o Xcode começará a resolver e fazer o download das
dependências em segundo plano automaticamente.
Caso você ainda não tenha vinculado o app ao projeto do Firebase, faça isso no
console do Firebase.
Na página Métodos de login, ative o método de login
Anônimo.
Opcional: se o projeto teve upgrade para o
Firebase Authentication with Identity Platform, você pode ativar a limpeza automática. Quando
você faz isso, contas anônimas com mais de 30 dias são automaticamente
excluídas. Em projetos com a limpeza automática ativada, a autenticação anônima não é mais contabilizada nos
limites de uso ou nas cotas de faturamento. Consulte
Limpeza automática.
Fazer a autenticação anônima no Firebase
Quando um usuário não conectado acessar um recurso do app que exige autenticação no Firebase, faça login dele anonimamente executando as seguintes etapas:
Importe o módulo FirebaseCore no
UIApplicationDelegate, assim como qualquer outro
módulo do Firebase usado pelo delegado do app.
Por exemplo, para usar Cloud Firestore, Authentication e:
Configure uma
instância compartilhada do
FirebaseApp no método application(_:didFinishLaunchingWithOptions:)
do delegado do app:
SwiftUI
// Use Firebase library to configure APIsFirebaseApp.configure()
Swift
// Use Firebase library to configure APIsFirebaseApp.configure()
Objective-C
// Use Firebase library to configure APIs[FIRAppconfigure];
Se você estiver usando a SwiftUI, crie um delegado do aplicativo e o anexe
ao struct App via UIApplicationDelegateAdaptor ou
NSApplicationDelegateAdaptor. Também é necessário desativar o swizzling do delegado do app. Para
mais informações, consulte as instruções da SwiftUI.
SwiftUI
@mainstructYourApp:App{// register app delegate for Firebase setup@UIApplicationDelegateAdaptor(AppDelegate.self)vardelegatevarbody:someScene{WindowGroup{NavigationView{ContentView()}}}}
Se o método signInAnonymouslyWithCompletion: for concluído com sucesso, você poderá coletar os dados da conta do usuário anônimo a partir do objeto FIRAuthDataResult:
Quando um usuário anônimo se inscreve no seu app, ele pode continuar
trabalhando com a nova conta. Por exemplo, você pode
deixar no carrinho de compras dessa conta os itens
adicionados antes do registro. Para isso, execute as seguintes
etapas:
Quando o usuário se registrar, conclua o fluxo de login do
provedor de autenticação até a chamada de um dos métodos, mas sem incluir essa etapa
FIRAuth.signInWith. Por exemplo, use o token de ID do Google,
o token de acesso do Facebook ou o e-mail e a senha.
Consiga um FIRAuthCredential para o novo provedor de autenticação:
Se a chamada a linkWithCredential:completion: for realizada corretamente, a nova conta do usuário terá
acesso aos dados do Firebase da conta anônima.
Limpeza automática
Se você fez upgrade do seu projeto para o Firebase Authentication with Identity Platform, será possível
ativar a limpeza automática no console do Firebase. Quando esse recurso é ativado, você permite
que o Firebase exclua automaticamente contas anônimas com mais de 30 dias. Em projetos com a limpeza
automática ativada, a autenticação anônima não é contabilizada nos limites de uso ou nas cotas de faturamento.
Todas as contas anônimas criadas após a ativação da limpeza automática podem ser excluídas
automaticamente a qualquer momento 30 dias após a criação.
As contas anônimas estarão qualificadas para exclusão automática 30 dias depois da
ativação da limpeza automática.
Se você desativar a limpeza automática, todas as contas anônimas programadas para exclusão vão continuar
dessa forma.
Se você fizer "upgrade" de uma conta anônima com vinculação a qualquer método de login, ela
não vai ser excluída automaticamente.
[null,null,["Última atualização 2025-08-16 UTC."],[],[],null,["You can use Firebase Authentication to create and use temporary anonymous accounts\nto authenticate with Firebase. These temporary anonymous accounts can be used to\nallow users who haven't yet signed up to your app to work with data protected\nby security rules. If an anonymous user decides to sign up to your app, you can\n[link their sign-in credentials to the anonymous\naccount](/docs/auth/ios/account-linking) so that they can continue to work with their protected data in\nfuture sessions.\n\nBefore you begin\n\n1. Use Swift Package Manager to install and manage Firebase dependencies.\n\n | Visit [our installation guide](/docs/ios/installation-methods) to learn about the different ways you can add Firebase SDKs to your Apple project, including importing frameworks directly and using CocoaPods.\n 1. In Xcode, with your app project open, navigate to **File \\\u003e Add Packages**.\n 2. When prompted, add the Firebase Apple platforms SDK repository: \n\n ```text\n https://github.com/firebase/firebase-ios-sdk.git\n ```\n | **Note:** New projects should use the default (latest) SDK version, but you can choose an older version if needed.\n 3. Choose the Firebase Authentication library.\n 4. Add the `-ObjC` flag to the *Other Linker Flags* section of your target's build settings.\n 5. When finished, Xcode will automatically begin resolving and downloading your dependencies in the background.\n2. If you haven't yet connected your app to your Firebase project, do so from the [Firebase console](//console.firebase.google.com/).\n3. Enable anonymous auth:\n 1. In the [Firebase console](//console.firebase.google.com/), open the **Auth** section.\n 2. On the **Sign-in Methods** page, enable the **Anonymous** sign-in method.\n 3. **Optional** : If you've upgraded your project to [Firebase Authentication with Identity Platform](/auth#identity-platform), you can enable automatic clean-up. When you enable this setting, anonymous accounts older than 30 days will be automatically deleted. In projects with automatic clean-up enabled, anonymous authentication will no longer count toward usage limits or billing quotas. See [Automatic clean-up](#auto-cleanup).\n\nAuthenticate with Firebase anonymously\n\nWhen a signed-out user uses an app feature that requires authentication with\nFirebase, sign in the user anonymously by completing the following steps:\n\n1. Import the `FirebaseCore` module in your `UIApplicationDelegate`, as well as any other [Firebase modules](/docs/ios/setup#available-pods) your app delegate uses. For example, to use Cloud Firestore and Authentication: \n\n SwiftUI \n\n ```swift\n import SwiftUI\n import FirebaseCore\n import FirebaseFirestore\n import FirebaseAuth\n // ...\n \n ```\n\n Swift \n\n ```swift\n import FirebaseCore\n import FirebaseFirestore\n import FirebaseAuth\n // ...\n \n ```\n\n Objective-C \n\n ```objective-c\n @import FirebaseCore;\n @import FirebaseFirestore;\n @import FirebaseAuth;\n // ...\n \n ```\n2. Configure a [`FirebaseApp`](/docs/reference/swift/firebasecore/api/reference/Classes/FirebaseApp) shared instance in your app delegate's `application(_:didFinishLaunchingWithOptions:)` method: \n\n SwiftUI \n\n ```swift\n // Use Firebase library to configure APIs\n FirebaseApp.configure()\n ```\n\n Swift \n\n ```swift\n // Use Firebase library to configure APIs\n FirebaseApp.configure()\n ```\n\n Objective-C \n\n ```objective-c\n // Use Firebase library to configure APIs\n [FIRApp configure];\n ```\n3. 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](/docs/ios/learn-more#swiftui). \n\n SwiftUI \n\n ```swift\n @main\n struct YourApp: App {\n // register app delegate for Firebase setup\n @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate\n\n var body: some Scene {\n WindowGroup {\n NavigationView {\n ContentView()\n }\n }\n }\n }\n \n ```\n4. Call the `signInAnonymouslyWithCompletion:` method: \n\n Swift \n\n ```swift\n Auth.auth().signInAnonymously { authResult, error in\n // ...\n }\n ```\n\n Objective-C \n\n ```objective-c\n [[FIRAuth auth] signInAnonymouslyWithCompletion:^(FIRAuthDataResult * _Nullable authResult,\n NSError * _Nullable error) {\n // ...\n }];\n ```\n5. If the `signInAnonymouslyWithCompletion:` method completes without error, you can get the anonymous user's account data from the `FIRAuthDataResult` object: \n\n Swift \n\n ```swift\n guard let user = authResult?.user else { return }\n let isAnonymous = user.isAnonymous // true\n let uid = user.uid\n ```\n\n Objective-C \n\n ```objective-c\n FIRUser *user = authResult.user;\n BOOL isAnonymous = user.anonymous; // YES\n NSString *uid = user.uid;\n ```\n\n| To protect your project from abuse, Firebase limits the number of new email/password and anonymous sign-ups that your application can have from the same IP address in a short period of time. You can request and schedule temporary changes to this quota from the [Firebase console](//console.firebase.google.com/project/_/authentication/providers).\n\nConvert an anonymous account to a permanent account\n\nWhen an anonymous user signs up to your app, you might want to allow them to\ncontinue their work with their new account---for example, you might want to\nmake the items the user added to their shopping cart before they signed up\navailable in their new account's shopping cart. To do so, complete the following\nsteps:\n\n1. When the user signs up, complete the sign-in flow for the user's authentication provider up to, but not including, calling one of the [`FIRAuth.signInWith`](/docs/reference/ios/firebaseauth/interface_f_i_r_auth) methods. For example, get the user's Google ID token, Facebook access token, or email address and password.\n2. Get an `FIRAuthCredential` for the new authentication provider:\n\n Google Sign-In \n\n Swift \n\n ```swift\n guard\n let authentication = user?.authentication,\n let idToken = authentication.idToken\n else {\n return\n }\n\n let credential = GoogleAuthProvider.credential(withIDToken: idToken,\n accessToken: authentication.accessToken)\n ```\n\n Objective-C \n\n ```objective-c\n FIRAuthCredential *credential =\n [FIRGoogleAuthProvider credentialWithIDToken:result.user.idToken.tokenString\n accessToken:result.user.accessToken.tokenString];\n ```\n\n Facebook Login \n\n Swift \n\n ```swift\n let credential = FacebookAuthProvider\n .credential(withAccessToken: AccessToken.current!.tokenString)\n ```\n\n Objective-C \n\n ```objective-c\n FIRAuthCredential *credential = [FIRFacebookAuthProvider\n credentialWithAccessToken:[FBSDKAccessToken currentAccessToken].tokenString];\n ```\n\n Email-password sign-in \n\n Swift \n\n ```swift\n let credential = EmailAuthProvider.credential(withEmail: email, password: password)\n ```\n\n Objective-C \n\n ```objective-c\n FIRAuthCredential *credential =\n [FIREmailAuthProvider credentialWithEmail:email\n password:password];\n ```\n3. Pass the `FIRAuthCredential` object to the sign-in user's\n `linkWithCredential:completion:` method:\n\n Swift \n\n ```swift\n user.link(with: credential) { authResult, error in\n // ...\n }\n }\n ```\n\n Objective-C \n\n ```objective-c\n [[FIRAuth auth].currentUser linkWithCredential:credential\n completion:^(FIRAuthDataResult *result, NSError *_Nullable error) {\n // ...\n }];\n ```\n\nIf the call to `linkWithCredential:completion:` succeeds, the user's new account can\naccess the anonymous account's Firebase data.\n| This technique can also be used to [link any two accounts](/docs/auth/ios/account-linking).\n\nAutomatic clean-up\n\nIf you've upgraded your project to [Firebase Authentication with Identity Platform](/docs/auth#identity-platform), you can\nenable automatic clean-up in the Firebase console. When you enable this feature you allow\nFirebase to automatically delete anonymous accounts older than 30 days. In projects with automatic\nclean-up enabled, anonymous authentication will not count toward usage limits or billing quotas.\n\n- Any anonymous accounts created after enabling automatic clean-up might be automatically deleted any time after 30 days post-creation.\n- Existing anonymous accounts will be eligible for automatic deletion 30 days after enabling automatic clean-up.\n- If you turn automatic clean-up off, any anonymous accounts scheduled to be deleted will remain scheduled to be deleted.\n- If you \"upgrade\" an anonymous account by linking it to any sign-in method, the account will not get automatically deleted.\n\nIf you want to see how many users will be affected before you enable this feature, and you've\nupgraded your project to [Firebase Authentication with Identity Platform](/docs/auth#identity-platform), you can filter by\n`is_anon` in [Cloud\nLogging](https://cloud.google.com/logging/docs).\n\nNext steps\n\nNow that users can authenticate with Firebase, you can control their access to\ndata in your Firebase database using\n[Firebase rules](/docs/database/security#section-authorization)."]]