push 传参

#定义需要传递的参数

class Arguments {
  int id;
  String title;
  dynamic any;
  Arguments(this.id, this.title, this.any);
}



#接受获取传过来的参数

class Me extends StatelessWidget {
  static const routeName = '/me';

  // @override
  // _MeState createState() => _MeState();

  Widget build(BuildContext context) {
    final Arguments args = ModalRoute.of(context).settings.arguments;
    return Text('me' + args.title);
  }
}

#把组件注册到路由表中

routes: {
        News.routeName: (context) => News(),
        App.routeName: (context) => App(),
        Me.routeName: (context) => Me(),
      },
      
#点击事件中填写参数

Center(
      child: ElevatedButton(
        onPressed: () {
          // Navigate back to first route when tapped.
          Navigator.pushNamed(context, Me.routeName,
              arguments: Arguments(2, 'fffffqqqq sd扥f', null));
        },
        child: Text('Go back!'),
      ),
    );

#方法二
使用 onGenerateRoute 提取参数  

修改push
 Navigator.push(
              context,
              MaterialPageRoute(
                  builder: (context) =>
                      Products(item: Arguments(4, 'dfgdf', null))));

接收数据                      
import 'package:flutter/material.dart';
import '../model/Arguments.dart';

class Products extends StatelessWidget {
  static const routeName = '/products';
  final Arguments item;

  Products({Key key, @required this.item}) : super(key: key);

  Widget build(BuildContext context) {
    return Text('data' + this.item.id.toString());
  }

  // @override
  // _ProductsState createState() => _ProductsState();
}


使用 onGenerateRoute 提取参数

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        // Provide a function to handle named routes. Use this function to
        // identify the named route being pushed, and create the correct
        // Screen.
        onGenerateRoute: (settings) {
          // If you push the PassArguments route
          if (settings.name == PassArgumentsScreen.routeName) {
            // Cast the arguments to the correct type: ScreenArguments.
            final ScreenArguments args = settings.arguments;

            // Then, extract the required data from the arguments and
            // pass the data to the correct screen.
            return MaterialPageRoute(
              builder: (context) {
                return PassArgumentsScreen(
                  title: args.title,
                  message: args.message,
                );
              },
            );
          }
          // The code only supports PassArgumentsScreen.routeName right now.
          // Other values need to be implemented if we add them. The assertion
          // here will help remind us of that higher up in the call stack, since
          // this assertion would otherwise fire somewhere in the framework.
          assert(false, 'Need to implement ${settings.name}');
          return null;
        },
        title: 'Navigation with Arguments',
        home: HomeScreen(),
        routes: {
          ExtractArgumentsScreen.routeName: (context) =>
              ExtractArgumentsScreen(),
        });
  }
}