Переменные можно передать обратно на предыдущую страницу в стеке навигатора, отправив их с помощью метода .pop()
и ожидая их на предыдущей странице с помощью метода .then()
:
class MainPage60643815 extends StatefulWidget {
@override
_MainPage60643815State createState() => _MainPage60643815State();
}
class _MainPage60643815State extends State<MainPage60643815> {
String displayTextFromSecondPage = '';
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Test from second page: '),
Text(displayTextFromSecondPage),
],
),
RaisedButton(
onPressed: goToSecondPage,
child: Text('Go to 2nd Page'),
),
],
),
);
}
void goToSecondPage(){
Navigator.of(context).push(MaterialPageRoute(
builder: (context) {
return SecondPage60643815(text: displayTextFromSecondPage);
}
)).then((valueFromSecondPage){
setState(() {
displayTextFromSecondPage = valueFromSecondPage;
});
});
}
}
class SecondPage60643815 extends StatefulWidget {
final String text;
SecondPage60643815({this.text});
@override
_SecondPage60643815State createState() => _SecondPage60643815State();
}
class _SecondPage60643815State extends State<SecondPage60643815> {
TextEditingController _textEditingController;
@override
void initState() {
_textEditingController = TextEditingController(
text: widget.text,
);
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: goToFirstPage,
),
),
body: Center(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
TextFormField(
controller: _textEditingController,
autofocus: true,
),
],
),
),
),
);
}
void goToFirstPage(){
Navigator.of(context).pop(_textEditingController.text);
}
}