नामित रूट और तर्क

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Named Routes Demo',
      initialRoute: '/',
      routes: {
        '/': (context) => HomeScreen(),
        '/details': (context) => DetailScreen(),
      },
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Home Screen')),
      body: Center(
        child: ElevatedButton(
          child: Text('Go to Details'),
          onPressed: () {
            Navigator.pushNamed(context, '/details');
          },
        ),
      ),
    );
  }
}

class DetailScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Detail Screen')),
      body: Center(
        child: Text('You are on the Detail Screen!',
          style: TextStyle(fontSize: 20)),
      ),
    );
  }
}

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Named Routes with Args',
      initialRoute: '/',
      routes: {
        '/': (context) => HomeScreen(),
        '/details': (context) => DetailScreen(),
      },
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Home Screen')),
      body: Center(
        child: ElevatedButton(
          child: Text('Go to Details with Message'),
          onPressed: () {
            Navigator.pushNamed(
              context,
              '/details',
              arguments: 'Hello from Home Screen!',
            );
          },
        ),
      ),
    );
  }
}

class DetailScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final String? message = 
        ModalRoute.of(context)!.settings.arguments as String?;

    return Scaffold(
      appBar: AppBar(title: Text('Detail Screen')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('You are on the Detail Screen!',
              style: TextStyle(fontSize: 20)),
            SizedBox(height: 20),
            Text('Message: ${message ?? "No message received"}',
              style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
          ],
        ),
      ),
    );
  }
}