In the section "Implementing FirebaseAuthUI for Facebook Login," it's not specifically stated to import FirebaseAuthUI in the AppDelegate and to import FirebaseFacebookAuthUI LoginViewController. Since they won't know, they will get errors typing out the code required, and autocomplete will not work.
In the section "Implementing FirebaseAuthUI for Facebook Login," it's not specifically stated to import FirebaseAuthUI in the AppDelegate and to import FirebaseFacebookAuthUI LoginViewController. Since they won't know, they will get errors typing out the code required, and autocomplete will not work.