How to pass arguments to pushReplacementNamed? - flutter

Question

In my application, when the 'Next' button is clicked, pushReplacementNamed is fired and the arguments are passed to the next screen. How can I implement a route with arguments? Need exactly pushReplacementNamed.
Here is an example code with push:
_changeColor(String color) {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => ColorWidget(color: color),
),
);
}
...
ElevatedButton(
onPressed: () => _changeColor(selectedValue),
child: const Text('Next'),
)
How can one also pass arguments with pushReplacementNamed?
My main.dart:
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
routes: {
'/': (context) => HomeScreenWidget(),
'/color_picker': (context) => ColorPickerWidget(),
'/text_value': (context) => TextValueScreen(),
},
initialRoute: '/',
);
}
}

Answer 1

You have to send data in arguments key and get it back by route.
Check this document https://docs.flutter.dev/cookbook/navigation/navigate-with-arguments

Answer 2

Simply use
var argument = 'example string';
Navigator.pushNamed(
context,
'/otherscreen',
arguments: {'exampleArgument': argument},
);
and extract the arguments as follows:
#override
Widget build(BuildContext context) {
final arguments = (ModalRoute.of(context)?.settings.arguments ?? <String, dynamic>{}) as Map;
print(arguments['exampleArgument']);
return Scaffold(...);