有几种方法可以做到这一点，但这里是我如何发送我的自定义模型的对象到下一个屏幕
首先在genrateRoute中声明一个变量作为你想要发送的模型

Route<dynamic> generateRoute(RouteSettings settings){
var tourModel = settings.arguments as TourModel;

在你的案例中，把上面的变量作为参数传递

case TourDetailScreen.routeName:
  return MaterialPageRoute(builder: (context) => TourDetailScreen(arguments : tourModel));

从你想导航的地方，像这样导航

Navigator.of(context).push(MaterialPageRoute(builder: (BuildContext context){
          return TourDetailScreen(
            arguments: toursList[index],
          );
        })

最后在你想导航的屏幕上

TourModel arguments;
TourDetailScreen({Key? key,required this.arguments}) : super(key: key);

和use可以在构建内部的任何地方使用参数，例如Text(arguments.yourFields)，

您也可以使用Navigator.pushNamed()方法的arguments参数在命名路由中传递数据。

Navigator.pushNamed(
      context,
      ExtractArgumentsScreen.routeName,
      arguments: ScreenArguments(
        'Extract Arguments Screen',
        'This message is extracted in the build method.',
      ),
    );

// A Widget that extracts the necessary arguments from
// the ModalRoute.
class ExtractArgumentsScreen extends StatelessWidget {
  const ExtractArgumentsScreen({super.key});

  static const routeName = '/extractArguments';

  @override
  Widget build(BuildContext context) {
    // Extract the arguments from the current ModalRoute
    // settings and cast them as ScreenArguments.
    final args = ModalRoute.of(context)!.settings.arguments as ScreenArguments;

    return Scaffold(
      appBar: AppBar(
        title: Text(args.title),
      ),
      body: Center(
        child: Text(args.message),
      ),
    );
  }
}

参考：https://docs.flutter.dev/cookbook/navigation/navigate-with-arguments

创建一个类似这样的类：

class ContactsDetailArguments {
  final ContactModel contactDetail;

  ContactsDetailArguments({
    @required this.contactDetail,
  });
}

并像这样更改您的ContactsDetail：

class ContactsDetail extends StatelessWidget {
      ContactsDetailArguments arguments;
      ContactsDetail({Key? key, required this.arguments}) : super(key: key);
...
}

然后在您的路由配置中执行以下操作：

var arg = settings.arguments as ContactsDetailArguments;
return MaterialPageRoute(builder: (context) => const LoginScreen(arguments: arg));