flutter解决长按TextField出现英文（复制粘贴）问题

第一步 引入依赖

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter

第二步 在main.dart中添加代码

 MaterialApp(
   //省略若干代码........
  //国际化
  localizationsDelegates: [
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
    GlobalCupertinoLocalizations.delegate,
  ],
  supportedLocales: [
    const Locale('zh', 'CN'),
    const Locale('en', 'US'),
  ],
）

第三步 重启app