Flutter:如何关闭屏幕上出现的所有对话框？

import 'package:flutter/material.dart';

Navigator.popUntil(context, (route) => route.isFirst);

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Close Dialogs Example'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Close Dialogs'),
            onPressed: () {
              Navigator.popUntil(context, (route) => route.isFirst);
            },
          ),
        ),
      ),
    );
  }
}