Flutter: Navigator.of(context).pop()返回黑屏

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('Flutter Navigator Example')),
        body: Center(
          child: ElevatedButton(
            onPressed: () {
              Navigator.of(context).push(
                MaterialPageRoute(builder: (context) => SecondPage()),
              );
            },
            child: Text('Go to Second Page'),
          ),
        ),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Second Page')),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            Navigator.of(context).pop();
          },
          child: Text('Go Back'),
        ),
      ),
    );
  }
}