我在Flutter中使用库比蒂诺设计，并使用CupertinoTabBar。我想从不同的屏幕访问不同的选项卡项目。
例如，我有两个项目：主页和配置文件。CupertinoTabBar在主屏幕中定义。从HomeScreen，我想有一个按钮来访问ProfileScreen选项卡。如何在这种情况下导航？

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class MainScreen extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _MainScreenState();
  }
}

class _MainScreenState extends State<MainScreen> {

  @override
  Widget build(BuildContext context) {
    return Material(
      child: CupertinoTabScaffold(
        tabBar: CupertinoTabBar(
          items: const <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              title: Text("Home")
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.user),
              title: Text("My Appointments")
            )
          ],
        ),
        tabBuilder: (BuildContext context, int index) {
          switch (index) {
            case 0:
              return CupertinoTabView(
                builder: (BuildContext context) {
                  return HomeScreen();
                },
                defaultTitle: 'Home',
              );
              break;
            case 1:
              return CupertinoTabView(
                builder: (BuildContext context) => ProfileScreen(),
                defaultTitle: 'Profile',
              );
              break;
          }

          return null;
        },
      ),
    );
  }
}

class HomeScreen extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return Container(
      child: CupertinoButton(
            child: Text("Check Profile"),
            onPressed: () {
              // Pop this page and Navigate to Profile page
            },
          )
    );
  }
}

class ProfileScreen extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return Container(
      child: Text("Profile")
    );
  }
}