iOS

Native implementation

iOS uses the GoogleSignIn SDK.

Before sign-in, the package creates:

GIDConfiguration(clientID: iosClientId, serverClientID: webClientId)

GID is Google's prefix for the iOS Sign-In SDK types. For example:

• GIDSignIn is the sign-in manager.
• GIDConfiguration holds OAuth client configuration.
• GIDGoogleUser is the signed-in user object.

Client IDs

clientID is the iOS OAuth client ID.

serverClientID is Google's SDK name for the OAuth Web client ID. The package public API calls it webClientId because that is the actual credential you provide.

iOS client ID lookup order

If iosClientId is not passed, the native module tries:

1. GIDClientID in Info.plist.
2. CLIENT_ID from bundled GoogleService-Info.plist.

If no iOS client ID is available, sign-in fails before opening Google.

URL scheme

iOS must be able to return from Google to your app. Register the reversed iOS client ID as a URL scheme:

com.googleusercontent.apps.<reversed-ios-client-id>

The Expo config plugin can derive this from iosClientId when the client ID has the standard *.apps.googleusercontent.com format.

Clear credential state

On iOS, clearGoogleCredentialState() calls:

GIDSignIn.sharedInstance.signOut()