Flutter 我想将我的模型类对象发送到下一个屏幕之前我这样做首先我在第二个屏幕中声明对象

Hello i want to send my model class object to next screen previously i do it like this first i declare object in the second screen where i want to naviagte个

 class ContactsDetail extends StatelessWidget {
      ContactModel contactDetail;
      ContactsDetail({Key? key, required this.contactDetail}) : super(key: key);
    
    Then in navigator i passed the argument  
    
        onTap: () async {
                
                    Navigator.of(context).push(MaterialPageRoute<void>(builder: (BuildContext context) {
                        return ContactsDetail(
                          contactDetail: contactlist[index],);
                      },
                    ));
                  },`enter code here`

Which works perfectly, Now i am working with name routes and i want to send the whole model of current index data same as i do above but i am unable to do this Now here is my routes .个

Route<dynamic> generateRoute(RouteSettings settings){
switch(settings.name)
{
  case LoginScreen.routeName:
  return MaterialPageRoute(builder: (context) => const LoginScreen());
  case TourDetailScreen.routeName:
    return MaterialPageRoute(builder: (context) => TourDetailScreen());

  default:
    return errorRoute();
}
}

And here is the class to which i want to send data

class TourDetailScreen extends StatelessWidget {
  static const routeName = 'tourist_detail_screen';
  TourModel tourDetails;
  TourDetailScreen({Key? key,required this.tourDetails}) : super(key: key);

and this is main 
MaterialApp(
        debugShowCheckedModeBanner: false,

        initialRoute: TouristHomeScreen.routeName,
        onGenerateRoute: (settings) => generateRoute(settings),
      ),