With FirebaseAppDelegateProxyEnabled = false, phone authentication hangs and then crashes

[dlcole]

This is related to the fix proposed in issue 221 regarding 'No APNS token specified error...

    <key>FirebaseAppDelegateProxyEnabled</key>
    <false/>

Adding the above lines to info.plist is sufficient to bypass the APNS error on iOS devices, but not iOS emulators.

BUT, this changes causes a hang in the login process. In particular,

let idp = await firebase().ui().show({ providers: [new PhoneProvider()] });

yields this sequence:

1. Welcome screen presented, with "Sign in with phone" button as only visible option - tap button
2. Enter phone number screen presented - enter number and tap Verify
3. Verifying you’re not a robot… screen appears briefly
4. about:blank screen appears, empty screen with Done (upper-left) and refresh (upper-right) as only options, and tapping Done cancels the login with an error, The interaction was cancelled by the user, and crashes
5. When I attempt to display the error message with an alert, the still app crashes, even within a try/catch block
6. When I attempt to log in again, ui().show crashes with the error message, Error: Cannot read properties of undefined (reading 'presentViewControllerAnimatedCompletion')

Might some type of Firebase AppDelegate be required for phone authentication?

[dlcole]

I have found through my investigation that is sufficient to call getAPNSToken() prior to calling getToken() to avoid the dreaded error message

Error: The operation couldn’t be completed. No APNS token specified before fetching FCM Token

Doing so also avoids their hang/crash problem documented in this issue, so I will close it. You'll still want to catch the error, as it will be thrown on iOS emulators. My code, in app-root.js, looks like this:

try {
   const authStatus = await firebase().messaging().requestPermission({ ios: { alert: true, }, });
   const enabled = authStatus === AuthorizationStatus.AUTHORIZED || authStatus === AuthorizationStatus.PROVISIONAL;
   if (enabled) {
     await firebase().messaging().registerDeviceForRemoteMessages();
     firebase().messaging().showNotificationsWhenInForeground = false;

     const aPNSToken = firebase().messaging().getAPNSToken(); 
     const token = await firebase().messaging().getToken();
     global.deviceToken = token;
     // code to handle token... 

     firebase().messaging().onToken((token) => {
     // code to handle token
     });

      ...

} catch (e) {
   console.warn("app-root error: " + e);
 }

I have removed the lines from info.plist suggested by [issue 221](https://github.com/NativeScript/firebase/issues/221).