Can FirebaseAuth 5.0.x be used in an iOS app extension?
问题 FirebaseAuth uses [UIApplication sharedApplication] in FIRAuth.m . Since that API is not available to App Extensions, it appears that FirebaseAuth (and anything that depends on it, such as Firestore) can not be used in an App Extension. Is there any way around this limitation? 回答1: Update: Firebase confirms that a fix is targeted for 5.2.x version. Track the Github issue for latest updates. It seems as Firebase is not officially supporting extensions in iOS. I have got that info from this