(If you think about it, you've never seen an app (in the last years anyhow, since privacy has become an important topic) installed on your device getting that information without asking you. No reason to assume you could get the info if they weren't able.)
Yes, privacy concerns are issues and I have to ask anyway.
I think with android you can get the logged-in users email using account manager, and thats why i want to know if there is something similar in ios.
If you are using FirebaseAuth then use this class instead: https://www.b4x.com/android/forum/threads/sign-in-with-apple-and-firebase.116280/ Starting from iOS 13 there is integral support for letting the user sign in with the user Apple ID. The AppleAuthButton is a custom view that manages...