Flutter PageView:禁用左侧或右侧滚动

import 'package:flutter/material.dart';

class MyPageView extends StatefulWidget {
  @override
  _MyPageViewState createState() => _MyPageViewState();
}

class _MyPageViewState extends State<MyPageView> {
  PageController _pageController;
  bool _isLeftScrollEnabled = true;
  bool _isRightScrollEnabled = true;

  @override
  void initState() {
    super.initState();
    _pageController = PageController(initialPage: 0);
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageView(
        controller: _pageController,
        physics: _isLeftScrollEnabled && _isRightScrollEnabled
            ? AlwaysScrollableScrollPhysics()
            : NeverScrollableScrollPhysics(),
        onPageChanged: (index) {
          setState(() {
            _updateScrollStatus(index);
          });
        },
        children: [
          // 页面列表
        ],
      ),
    );
  }

  void _updateScrollStatus(int currentIndex) {
    setState(() {
      _isLeftScrollEnabled = currentIndex != 0;
      _isRightScrollEnabled = currentIndex != pageCount - 1;
    });
  }
}