Flutter如何使push()看起来像pop()

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Go to Next Page'),
          onPressed: () {
            Navigator.push(
              context,
              PageRouteBuilder(
                pageBuilder: (context, animation, secondaryAnimation) => NextPage(),
                transitionsBuilder: (context, animation, secondaryAnimation, child) {
                  return SlideTransition(
                    position: Tween<Offset>(
                      begin: Offset(0.0, 1.0),
                      end: Offset.zero,
                    ).animate(animation),
                    child: FadeTransition(
                      opacity: animation,
                      child: child,
                    ),
                  );
                },
                transitionDuration: Duration(milliseconds: 500),
              ),
            );
          },
        ),
      ),
    );
  }
}

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