setA4Reference method

Implementation

@override
Future<void> setA4Reference(double a4Reference) async {
  try {
    await _methodChannel.invokeMethod('setA4Reference', {
      'setA4Reference': a4Reference,
    });
  } on PlatformException catch (e) {
    throw Exception('Failed to set A4 reference: ${e.message}');
  }
}