[firebase_analytics] Questions regarding App Tracking Transparency on iOS

[antonshkurenko]

Hi,

I've read lots of documentation, StackOverflow and GitHub issues and I'm very confused about when I should ask a user consent

Docs stand, that it should be somewhere right after Firebase.configureApp() (https://firebase.google.com/docs/ios/supporting-ios-14), but:

1. On Flutter I don't have such method, I only have Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform,); which I use for Crashlytics too (and I plan to use it for other things later)
2. If I do init in void main(), how can I present a nice explanation screen for the user?

Other questions:

1. Is it possible to configure Firebase, then in some time (for example during onboarding) request permission for tracking? Will Firebase somehow automatically hook that event and start using IDFA? Will it lose partially info for events, which were created before?
2. If I somehow (if it's possible) init Crashlytics at the beginning and Analytics during onboarding, what should I do with my other events? For example common event "tutorial_begin"?

My use case (at least what I expect):

1. Firebase init
2. It logs "first_open" (no data about gender, age etc)
3. It logs "tutorial_begin" (no data about gender, age etc)
4. I ask for permission
5. User gives it (I hope)
6. It logs "tutorial_complete" (will there be data about gender, age? will it be copied for previous events too?)
7. At this point firebase starts to use it?

If you have a sample project, I will appreciate that. Anyway, thanks for you time and help!