[Android/IOS] Flutter如何实现禁止手机横屏的功能

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import 'package:flutter/services.dart';

void main() async => {
  WidgetsFlutterBinding.ensureInitialized();
  await SystemChrome.setPreferredOrientations(
    [
      DeviceOrientation.portraitUp,   // 竖屏 Portrait 模式
      DeviceOrientation.portraitDown, 
      // DeviceOrientation.landscapeLeft, // 横屏 Landscape 模式
      // DeviceOrientation.landscapeRight,
    ],
  );
  runApp(MainApp());
};

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@override
  void initState() {
    super.initState();
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.landscapeRight,
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
    ]);
  }

  @override
  void dispose() {
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
    ]);
    super.dispose();
  }