在添加/删除页面上不更新消费者的Flutter PageView，除非手动翻到不同的页面

import 'package:flutter/material.dart';

class MyPage extends StatefulWidget {
  @override
  _MyPageState createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> {
  PageController _pageController;
  int _currentPage = 0;
  List<Widget> _pages = [
    // 添加或删除页面后，更新该列表
    Container(
      color: Colors.red,
    ),
    Container(
      color: Colors.blue,
    ),
    Container(
      color: Colors.green,
    ),
  ];

  @override
  void initState() {
    super.initState();
    _pageController = PageController(initialPage: _currentPage);
  }

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }

  void _updatePage() {
    setState(() {
      _pages.add(
        Container(
          color: Colors.yellow,
        ),
      );
    });
    // 更新页面后，将PageView滚动到当前页面
    _pageController.jumpToPage(_currentPage);
  }

  void _removePage() {
    setState(() {
      _pages.removeLast();
    });
    // 更新页面后，将PageView滚动到当前页面
    _pageController.jumpToPage(_currentPage);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('PageView Example'),
      ),
      body: Column(
        children: [
          Expanded(
            child: PageView(
              controller: _pageController,
              onPageChanged: (int page) {
                setState(() {
                  _currentPage = page;
                });
              },
              children: _pages,
            ),
          ),
          SizedBox(height: 16),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              ElevatedButton(
                onPressed: _updatePage,
                child: Text('添加页面'),
              ),
              SizedBox(width: 16),
              ElevatedButton(
                onPressed: _removePage,
                child: Text('删除页面'),
              ),
            ],
          ),
        ],
      ),
    );
  }
}