チュートリアル: iOS 広告のコンバージョンを測定する

handle = Auth.auth().addStateDidChangeListener { auth, user in
  // Get the user's email address
  let email = user.email
  // or get their phone number
  let phoneNumber = user.phoneNumber
  // ...
}

self.handle = [[FIRAuth auth]
  addAuthStateDidChangeListener:^(FIRAuth *_Nonnull auth, FIRUser *_Nullable user) {
    // Get the user's email address
    NSString *email = user.email;
    // or get their phone number
    NSString *phoneNumber = user.phoneNumber;
    // ...
  }];

Firebase.Auth.FirebaseAuth auth;
Firebase.Auth.FirebaseUser user;

// Handle initialization of the necessary firebase modules:
void InitializeFirebase() {
  auth = Firebase.Auth.FirebaseAuth.DefaultInstance;
  auth.StateChanged += AuthStateChanged;
  AuthStateChanged(this, null);
}

// Track state changes of the auth object.
void AuthStateChanged(object sender, System.EventArgs eventArgs) {
  if (auth.CurrentUser != user) {
    bool signedIn = user != auth.CurrentUser && auth.CurrentUser != null;
    user = auth.CurrentUser;
    if (signedIn) {
      // Get the user's email address
      string email = user.Email;
      // or get their phone number
      string phoneNumber = user.PhoneNumber;
      // ...
    }
  }
}

// Handle removing subscription and reference to the Auth instance.
// Automatically called by a Monobehaviour after Destroy is called on it.
void OnDestroy() {
  auth.StateChanged -= AuthStateChanged;
  auth = null;
}