Custom theme is not working in IOS for flutter?

I have created a custom theme in flutter app. It working fine in android but have only violate color in ios. I tried but nothing is changed.

main.dart

    import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:get_storage/get_storage.dart';
import 'package:newflutter/ui_helper/theme_const.dart';
import 'package:newflutter/views/decider.dart';
import 'package:flutter/services.dart';
import 'package:upgrader/upgrader.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  // await Upgrader.clearSavedSettings();
  await Firebase.initializeApp();
  FirebaseMessaging messaging = FirebaseMessaging.instance;

  print('User granted permission: ${settings.authorizationStatus}');

  await GetStorage.init();
  final localMemory = GetStorage();
  bool? isDarkTheme = localMemory.read('isDark');
  localMemory.write('isFirstTimeHome', true);

  runApp(MyApp(
    isDarkTheme: isDarkTheme,
  ));
}

class MyApp extends StatelessWidget {
  final bool? isDarkTheme;
  const MyApp({super.key, this.isDarkTheme});

  get camera => null;



  @override
  Widget build(BuildContext context) {
    isDarkTheme == null || isDarkTheme == true
        ? SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
            statusBarColor: Colors.transparent,
            statusBarIconBrightness: Brightness.light,
            systemNavigationBarColor: Colors.black,
            systemNavigationBarDividerColor: Colors.black,
            systemNavigationBarIconBrightness: Brightness.dark,
          ))
        : null;

    return GetMaterialApp(
      title: 'Test',
      debugShowCheckedModeBanner: false,
    
      themeMode: isDarkTheme == null || isDarkTheme == true
          ? ThemeMode.light
          : ThemeMode.dark,
      theme: lightTheme,
      darkTheme: darkTheme,

      home: UpgradeAlert(upgrader: Upgrader(), child: const Decider()),
    );
  }
}

theme file

    import 'package:flutter/material.dart';

// Define your custom primary color
MaterialColor customPrimaryColor = const MaterialColor(
  0xFF10489B,
  <int, Color>{
    50: Color(0xFFss10489B),
    100: Color(0xFF10489B),

    800: Color(0xFFss10489B),
    900: Color(0xFF10ss489B),
  },
);

ThemeData lightTheme = ThemeData(
  primarySwatch: customPrimaryColor,
  primaryColorDark: Colors.indigoAccent,
  primaryColorLight: const Color(0xffC3D8FB),

  fontFamily: 'Mulish',
  brightness: Brightness.light,

  textTheme: const TextTheme(
    displayLarge: TextStyle(
      fontWeight: FontWeight.w600,
      fontFamily: 'Mulish-Bold',
      fontSize: 22,
      color: Color(0xff000000),
    ),

    headlineSmall: TextStyle(
      fontWeight: FontWeight.w700,
      fontFamily: 'Mulish-Bold',
      fontSize: 16,
      color: Color(0xff000000),
    ),
    
  ),

);

ThemeData darkTheme = ThemeData(
  brightness: Brightness.dark,
  //primarySwatch: Colors.red,
  primaryColorDark: const Color.fromARGB(255, 39, 39, 39),
  primaryColorLight: const Color(0xff444444),
  cardTheme: const CardTheme(elevation: 0),
  fontFamily: 'Mulish',
  textTheme: const TextTheme(
    displayLarge: TextStyle(
      fontWeight: FontWeight.w600,
      fontFamily: 'Mulish-Bold',
      fontSize: 22,
      color: Color(0xffffffff),
    ),

    headlineSmall: TextStyle(
      fontWeight: FontWeight.w700,
      fontFamily: 'Mulish-Bold',
      fontSize: 16,
      color: Color(0xffffffff),
    ),

  ),

);

Please check this one and let me know if anyone find issue. Thankx in advance. please see this once. I have added theme file and main.dart file also