You can integrate Firebase Authentication with a custom authentication system by modifying. This SwiftUI Firebase Tutorial walks you through how to use Firebase Auth Authentication and. You can use Firebase Authentication to allow users to sign in to your app using one or more sign-in. Using Firebase Authentication with SwiftUI Most iOS applications will probably require some. Sign in with Apple using SwiftUI and Firebase by Peter Friese Firebase Developers Medium Rapid. In Authentication section of Firebase Console under users tab you will now find authenticated anonymous..