How to restrict login options to "Apple Sign In" instead of showing form-based logins as well?

[derwaldgeist]

Our app uses multiple ways of authenticating a user, including login with username and password. Since some recent iOS update, everytime the Apple Sign In dialog pops up for a user that already had logged in with Apple before, Apple's login dialog shows all username/password options in addition to the actual Apple Sign In option. These login methods won't work, as there is no dialog to put a username and password in on our very first app screen. Is there a way to prevent iOS from showing these additional credentials, i.e. restrict the login options to Apple Sign In only?

[lupidan]

It may be that it's detecting a pair of User Id+Password inside the keychain for your particular app identifier, probably used in the past, or maybe in a website that shares your app ID or associated domain.

The "QuickLogin" (which at some point should be renamed to "CheckExistingCredentials" or something similar...) does check both SIWA, and keychain credentials, I believe that's why it shows both options in your particular case. I don't think it's related to the updated iOS version.

If you would like to strictly restrict it to SIWA, with the current code, I suggest you just call "LoginWithApple" and that's it.

[derwaldgeist]

Thanks for the feedback! Just saw it, so sorry for the late response.

If I understand you correctly, "LoginWithApple" would work as a QuickLogin substitute?

Our app actually supports logins with username and password. If the QuickLogin supports this as well, is there a way to get that data and pass it to our login mechanism?