takeInitialNdefMessage method
The NDEF message that launched the app, if it was launched by a background tag read.
Consumed by the first call, so a widget rebuild cannot process it twice.
Implementation
Future<NdefMessage?> takeInitialNdefMessage() async {
final message = await iosApi.takeInitialNdefMessage();
return message == null ? null : ndefMessageFromWire(message);
}