flutter最下面有是导航菜单，根据手势向其他页面滑动

flutter最下面有是导航菜单，根据手势向其他页面滑动

import 'package:flutter/material.dart';

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

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

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _currentIndex = 0;
  PageController _pageController = PageController();

  void _onTabTapped(int index) {
    setState(() {
      _currentIndex = index;
    });
    _pageController.animateToPage(
      index,
      duration: Duration(milliseconds: 500),
      curve: Curves.ease,
    );
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('底部导航菜单示例'),
      ),
      body: PageView(
        controller: _pageController,
        children: <Widget>[
          Center(
            child: Text('页面 1'),
          ),
          Center(
            child: Text('页面 2'),
          ),
          Center(
            child: Text('页面 3'),
          ),
        ],
        onPageChanged: (int index) {
          setState(() {
            _currentIndex = index;
          });
        },
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: _onTabTapped,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: '首页',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.search),
            label: '搜索',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: '个人',
          ),
        ],
      ),
    );
  }
}