Dec 19, 2019
Firebase Auth State Listeners iOS
Receive notification when firebase users auth state changes on iOS.
Firebase auth lets you pass a handler function when the auth state changes.
In my use case I need to receive state change alerts. My user might be disabled by an admin or a bot, or the account is stopped for security reasons. But, I need to update user interfaces and data code to match that the user is logged out.
Fortunately its easy with firebase
Somewhere in your startup code -I use a container view for all my views, but the AppDelegate or SceneManager works well here- put this snippet in.
func setAuthListener() {
Auth.auth().addStateDidChangeListener { (auth, user) in
guard let user else {
// The user is either logged out, or something went wrong.
// You can use the Auth.auth().currentUser.reload() function
// to try to find the error using the FIRErrorCode enum
return
}
// Otherwise, we now have a signed in user. Usually that just means
// we carry on, but you could put some custom handler here too.
}
}
Then just fire that function somewhere at the start of your app, or in a container controller like we made in this article.
Dec 19, 2019