Scanner area border isn't created and scan doesn't work after toggle flash (IOS)

[valera21115]

flutter: 3.0.2
ai_barcode: 3.2.2

After opening scanner screen in IOS scan area border isn't created and exception is thrown .

Also, after toggle flash, scan doesn't work.

main.dart

import 'package:flutter/material.dart';

import 'scanner_screen.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: HomePage(title: 'Home page'),
    );
  }
}

class HomePage extends StatelessWidget {
  const HomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(title),
        ),
        body: Center(
            child:ElevatedButton(onPressed: () {Navigator.push(context, MaterialPageRoute(builder: (context) => const ScannerScreen()));},
                child: const Text('Open scanner'))
        ));
  }
}

scanner_screen.dart

import 'dart:io';

import 'package:ai_barcode/ai_barcode.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';

class ScannerScreen extends StatefulWidget {
  const ScannerScreen({Key? key}) : super(key: key);

  @override
  State<ScannerScreen> createState() => _ScannerScreenState();
}

class _ScannerScreenState extends State<ScannerScreen> {
  late ScannerController _scannerController;
  bool _isFlashOn = false;
  String? barcode;

  @override
  void initState() {
    super.initState();
    _scannerController = ScannerController(scannerResult: (barcode)  => setState(()=> this.barcode = barcode), scannerViewCreated: () {
      if (Platform.isIOS) {
        Future.delayed(const Duration(seconds: 2), () {
          _scannerController.startCamera();
          _scannerController.startCameraPreview();
        });
      } else {
        _scannerController.startCamera();
        _scannerController.startCameraPreview();
      }
    });
  }

  @override
  Widget build(BuildContext context) => SafeArea(
    child: Scaffold(
      body: FutureBuilder<bool?>(
        future: Permission.camera.request().isGranted,
        builder: (_, snapshot) {
          if (snapshot.hasData) {
            return  Stack(
              children: <Widget>[
                PlatformAiBarcodeScannerWidget(
                  platformScannerController: _scannerController,
                ),
                  Padding(
                      padding: const EdgeInsets.only(top: 8),
                      child: IconButton(
                          padding: const EdgeInsets.only(left: 14),
                          onPressed: () {
                            _scannerController.toggleFlash();
                            setState(() => _isFlashOn = !_isFlashOn);
                          },
                          icon: Icon(
                            _isFlashOn ? Icons.flash_on : Icons.flash_off,
                            color: Colors.white,
                            size: 40,
                          ))),
                Align(alignment: Alignment.bottomCenter,child: Text(barcode == null ? 'Scan a code' :  barcode!, style: const TextStyle(color: Colors.red, fontSize: 24)))
              ],
            );
          }
          return const Center(child: CircularProgressIndicator());
        },
      ),
    ),
  );
}