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final todo = ModalRoute.of(context)!.settings.arguments as Todo;
// Use the Todo to create the UI.
return Scaffold(
appBar: AppBar(
title: Text(todo.title),
),
body: Padding(
padding: const EdgeInsets.all(16),
child: Text(todo.description),
),
);
}
}<code_end>
<topic_end>
<topic_start>Return data from a screen
In some cases, you might want to return data from a new screen.
For example, say you push a new screen that presents two options to a user.
When the user taps an option, you want to inform the first screen
of the user’s selection so that it can act on that information.You can do this with the Navigator.pop()
method using the following steps:<topic_end>
<topic_start>
1. Define the home screen
The home screen displays a button. When tapped,
it launches the selection screen.
<code_start>class HomeScreen extends StatelessWidget {
const HomeScreen({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Returning Data Demo'),
),
// Create the SelectionButton widget in the next step.
body: const Center(
child: SelectionButton(),
),
);
}
}<code_end>
<topic_end>
<topic_start>
2. Add a button that launches the selection screen
Now, create the SelectionButton, which does the following:
<code_start>class SelectionButton extends StatefulWidget {
const SelectionButton({super.key});
@override
State<SelectionButton> createState() => _SelectionButtonState();
}
class _SelectionButtonState extends State<SelectionButton> {
@override
Widget build(BuildContext context) {
return ElevatedButton(
onPressed: () {
_navigateAndDisplaySelection(context);
},
child: const Text('Pick an option, any option!'),
);
}
Future<void> _navigateAndDisplaySelection(BuildContext context) async {
// Navigator.push returns a Future that completes after calling
// Navigator.pop on the Selection Screen.
final result = await Navigator.push(
context,
// Create the SelectionScreen in the next step.
MaterialPageRoute(builder: (context) => const SelectionScreen()),
);
}
}<code_end>
<topic_end>
<topic_start>
3. Show the selection screen with two buttons
Now, build a selection screen that contains two buttons.
When a user taps a button,
that app closes the selection screen and lets the home
screen know which button was tapped.This step defines the UI.
The next step adds code to return data.
<code_start>class SelectionScreen extends StatelessWidget {
const SelectionScreen({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Pick an option'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Padding(
padding: const EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () {
// Pop here with "Yep"...
},
child: const Text('Yep!'),
),
),
Padding(
padding: const EdgeInsets.all(8),
child: ElevatedButton(