Create a user
You create a new user in your Firebase project by calling the createUser
method or by signing in a user for the first time using a federated identity
provider, such as Google Sign-In
or Facebook Login
.
You can also create new password-authenticated users from the Authentication section of the Firebase console , on the Users page.
Get the currently signed-in user
The recommended way to get the current user is by setting a listener on the Auth object:
Swift
handle = Auth . auth (). addStateDidChangeListener { auth , user in // ... }
Objective-C
self . handle = [[ FIRAuth auth ] addAuthStateDidChangeListener : ^ ( FIRAuth * _Nonnull auth , FIRUser * _Nullable user ) { // ... }];
By using a listener, you ensure that the Auth object isn't in an intermediate state—such as initialization—when you get the current user.
You can also get the currently signed-in user by using the currentUser
property. If a user isn't signed in, currentUser
is nil:
Swift
if Auth . auth (). currentUser != nil { // User is signed in. // ... } else { // No user is signed in. // ... }
Objective-C
if ([ FIRAuth auth ]. currentUser ) { // User is signed in. // ... } else { // No user is signed in. // ... }
Get a user's profile
To get a user's profile information, use the properties of an instance of FIRUser
. For example:
Swift
let user = Auth . auth (). currentUser if let user = user { // The user's ID, unique to the Firebase project. // Do NOT use this value to authenticate with your backend server, // if you have one. Use getTokenWithCompletion:completion: instead. let uid = user . uid let email = user . email let photoURL = user . photoURL var multiFactorString = "MultiFactor: " for info in user . multiFactor . enrolledFactors { multiFactorString += info . displayName ?? "[DispayName]" multiFactorString += " " } // ... }
Objective-C
FIRUser * user = [ FIRAuth auth ]. currentUser ; if ( user ) { // The user's ID, unique to the Firebase project. // Do NOT use this value to authenticate with your backend server, // if you have one. Use getTokenWithCompletion:completion: instead. NSString * email = user . email ; NSString * uid = user . uid ; NSMutableString * multiFactorString = [ NSMutableString stringWithFormat : @"MultiFactor: " ]; for ( FIRMultiFactorInfo * info in user . multiFactor . enrolledFactors ) { [ multiFactorString appendString : info . displayName ]; [ multiFactorString appendString : @" " ]; } NSURL * photoURL = user . photoURL ; // ... }
Get a user's provider-specific profile information
To get the profile information retrieved from the sign-in providers linked to a
user, use the providerData
property. For example:
Swift
let userInfo = Auth . auth (). currentUser ?. providerData [ indexPath . row ] cell ?. textLabel ?. text = userInfo ?. providerID // Provider-specific UID cell ?. detailTextLabel ?. text = userInfo ?. uid
Objective-C
id<FIRUserInfo> userInfo = [ FIRAuth auth ]. currentUser . providerData [ indexPath . row ]; cell . textLabel . text = [ userInfo providerID ]; // Provider-specific UID cell . detailTextLabel . text = [ userInfo uid ];
Update a user's profile
You can update a user's basic profile information—the user's display name
and profile photo URL—with the UserProfileChangeRequest
class. For
example:
Swift
let changeRequest = Auth . auth (). currentUser ?. createProfileChangeRequest () changeRequest ?. displayName = displayName changeRequest ?. commitChanges { error in // ... }
Objective-C
FIRUserProfileChangeRequest * changeRequest = [[ FIRAuth auth ]. currentUser profileChangeRequest ]; changeRequest . displayName = userInput ; [ changeRequest commitChangesWithCompletion :^ ( NSError * _Nullable error ) { // ... }];
Set a user's email address
You can set a user's email address with the updateEmail
method.
For example:
Swift
Auth . auth (). currentUser ?. updateEmail ( to : email ) { error in // ... }
Objective-C
[[ FIRAuth auth ]. currentUser updateEmail : userInput completion :^ ( NSError * _Nullable error ) { // ... }];
Send a user a verification email
You can send an address verification email to a user with the sendEmailVerificationWithCompletion:
method. For example:
Swift
Auth . auth (). currentUser ?. sendEmailVerification { error in // ... }
Objective-C
[[ FIRAuth auth ]. currentUser sendEmailVerificationWithCompletion :^ ( NSError * _Nullable error ) { // ... }];
You can customize the email template that is used in Authentication section of the Firebase console , on the Email Templates page. See Email Templates in Firebase Help Center.
It is also possible to pass state via a continue URL to redirect back to the app when sending a verification email.
Additionally you can localize the verification email by updating the language code on the Auth instance before sending the email. For example:
Swift
Auth . auth (). languageCode = "fr" // To apply the default app language instead of explicitly setting it. // Auth.auth().useAppLanguage()
Objective-C
[ FIRAuth auth ]. languageCode = @"fr" ; // To apply the default app language instead of explicitly setting it. // [[FIRAuth auth] useAppLanguage];
Set a user's password
You can set a user's password with the updatePassword
method. For
example:
Swift
Auth . auth (). currentUser ?. updatePassword ( to : password ) { error in // ... }
Objective-C
[[ FIRAuth auth ]. currentUser updatePassword : userInput completion :^ ( NSError * _Nullable error ) { // ... }];
Send a password reset email
You can send a password reset email to a user with the sendPasswordReset
method. For example:
Swift
Auth . auth (). sendPasswordReset ( withEmail : email ) { error in // ... }
Objective-C
[[ FIRAuth auth ] sendPasswordResetWithEmail : userInput completion :^ ( NSError * _Nullable error ) { // ... }];
You can customize the email template that is used in Authentication section of the Firebase console , on the Email Templates page. See Email Templates in Firebase Help Center.
It is also possible to pass state via a continue URL to redirect back to the app when sending a password reset email.
Additionally you can localize the password reset email by updating the language code on the Auth instance before sending the email. For example:
Swift
Auth . auth (). languageCode = "fr" // To apply the default app language instead of explicitly setting it. // Auth.auth().useAppLanguage()
Objective-C
[ FIRAuth auth ]. languageCode = @"fr" ; // To apply the default app language instead of explicitly setting it. // [[FIRAuth auth] useAppLanguage];
You can also send password reset emails from the Firebase console.
Delete a user
You can delete a user account with the delete
method. For
example:
Swift
let
user
=
Auth
.
auth
().
currentUser
user
?.
delete
{
error
in
if
let
error
=
error
{
// An error happened.
}
else
{
// Account deleted.
}
}
Objective-C
FIRUser
*
user
=
[
FIRAuth
auth
].
currentUser
;
[
user
deleteWithCompletion
:^
(
NSError
*
_Nullable
error
)
{
if
(
error
)
{
// An error happened.
}
else
{
// Account deleted.
}
}];
You can also delete users from the Authentication section of the Firebase console , on the Users page.
Re-authenticate a user
Some security-sensitive actions—such as deleting an account
, setting a primary email address
, and changing a password
—require that the user has
recently signed in. If you perform one of these actions, and the user signed in
too long ago, the action fails with the FIRAuthErrorCodeCredentialTooOld
error. When this happens, re-authenticate the user by getting new sign-in
credentials from the user and passing the credentials to reauthenticate
. For
example:
Swift
let
user
=
Auth
.
auth
().
currentUser
var
credential
:
AuthCredential
// Prompt the user to re-provide their sign-in credentials
user
?.
reauthenticate
(
with
:
credential
)
{
error
in
if
let
error
=
error
{
// An error happened.
}
else
{
// User re-authenticated.
}
}
Objective-C
FIRUser
*
user
=
[
FIRAuth
auth
].
currentUser
;
FIRAuthCredential
*
credential
;
// Prompt the user to re-provide their sign-in credentials
[
user
reauthenticateWithCredential
:
credential
completion
:^
(
NSError
*
_Nullable
error
)
{
if
(
error
)
{
// An error happened.
}
else
{
// User re-authenticated.
}
}];
Import user accounts
You can import user accounts from a file into your Firebase project by using the
Firebase CLI's auth:import
command. For example:
firebase
auth
:
import
users.json
--
hash
-
algo
=
scrypt
--
rounds
=
8
--
mem
-
cost
=
14
