flutter怎么实现头部tabTop滚动栏

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效果图如下：

main.dart代码如下：

import 'package:flutter/material.dart';//启动函数void main() => runApp(MyApp());//自定义组件class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    //MaterialApp 是flutter的页面根组件    return MaterialApp(      title: 'main根页面',      debugShowCheckedModeBanner: false,  //清除debug      //home表示页面信息      home: AppbarTop()    );  }}//头部tabTop滚动栏效果组件import 'package:flutter/material.dart';class AppbarTop extends StatefulWidget {  @override  _AppbarTopState createState() => _AppbarTopState();}//混合SingleTickerProviderStateMixin类 同步属性class _AppbarTopState extends State<AppbarTop>    with SingleTickerProviderStateMixin {  //定义一个控制器  TabController _tabController;  @override  void initState() {    super.initState();    //混入SingleTickerProviderStateMixin的this    //实例化一个tab控制器 作用：    _tabController = TabController(length: choices.length, vsync: this);  }  _nextPage(index) {    int currentIndex = _tabController.index + index;    if (currentIndex < -0) currentIndex = _tabController.length - 1;    if (currentIndex >= _tabController.length) currentIndex = 0;    //控制器移动到currentIndex处    _tabController.animateTo(currentIndex);  }  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text('头部菜单栏'),        centerTitle: true, //title居中显示        leading: IconButton(            icon: Icon(Icons.arrow_back),            onPressed: () {              _nextPage(-1);            }),        iconTheme: IconThemeData(color: Colors.yellow), //头部icon样式颜色        //右边icon图标 可以多个        actions: <Widget>[          IconButton(              icon: Icon(Icons.arrow_forward),              onPressed: () {                _nextPage(1);              })        ],        actionsIconTheme: IconThemeData(color: Colors.white),        //自定义导航栏        bottom: PreferredSize(            child: Theme(              data: Theme.of(context).copyWith(accentColor: Colors.white),              child: Container(                height: 40,                alignment: Alignment.center, //圆点居中                //给自定义导航栏设置圆点控制器                child: TabPageSelector(                  controller: _tabController,                ),              ),            ),            preferredSize: Size.fromHeight(48)),      ),      //主体内容      body: TabBarView(        //主题内容也跟随控制器变化        controller: _tabController,        //将数据遍历成n个子组件数组        children: choices.map((item) {          return Padding(            padding: EdgeInsets.all(20),            child: ChoiceCard(              choice: item,            ),          );        }).toList(),      ),    );  }}//ChoiceCard将数据渲染到Card卡片组件上class ChoiceCard extends StatelessWidget {  final Choice choice;  const ChoiceCard({Key key, this.choice}) : super(key: key);  @override  Widget build(BuildContext context) {    //滚动时的卡片小部件    return Card(      color: Colors.blue,      child: Column(        mainAxisAlignment: MainAxisAlignment.center,        children: <Widget>[          Icon(choice.icon, size: 120, color: Colors.white,),          Text(choice.title),        ],      )    );  }}//数据的类型class Choice {  const Choice({this.title, this.icon});  final String title;  final IconData icon;}//模拟的数据const List<Choice> choices = const <Choice>[  const Choice(title: 'CAR', icon: Icons.directions_car),  const Choice(title: 'BICYCLE', icon: Icons.directions_bike),  const Choice(title: 'BOAT', icon: Icons.directions_boat),  const Choice(title: 'BUS', icon: Icons.directions_bus),  const Choice(title: 'TRAIN', icon: Icons.directions_railway),  const Choice(title: 'WALK', icon: Icons.directions_walk),];

效果图2：

代码如下：

//头部tabTop滚动栏效果组件class AppBarBottom extends StatefulWidget {  AppBarBottom({Key key}) : super(key: key);  @override  _AppBarBottomState createState() => _AppBarBottomState();}class _AppBarBottomState extends State<AppBarBottom> {  _SelectView(icon, text, id) {    return PopupMenuItem(        child: Row(      mainAxisAlignment: MainAxisAlignment.spaceAround,      children: <Widget>[        Icon(icon, color: Colors.blue),        Text(          text,          style: TextStyle(color: Colors.black),        )      ],    ));  }  @override  Widget build(BuildContext context) {    //tab使用这个组件    return DefaultTabController(        length: choices.length,        child: Scaffold(          appBar: AppBar(            title: Text('AppBar与TabBar'),            centerTitle: true,            actions: <Widget>[              PopupMenuButton(                  shape: BeveledRectangleBorder(                      borderRadius: BorderRadius.circular(10)),                  itemBuilder: (BuildContext context) {                    return [                      PopupMenuItem(                          child: _SelectView(Icons.message, '首页', 'A')),                      PopupMenuItem(                          child: _SelectView(Icons.message, '商品', 'B')),                      PopupMenuItem(                          child: _SelectView(Icons.message, '消息', 'C')),                    ];                  })            ],            bottom: TabBar(              isScrollable: true,              indicatorSize: TabBarIndicatorSize.label,              tabs: choices.map((item) {                return Tab(                  text: item.title,                  icon: Icon(item.icon),                );              }).toList(),            ),          ),          body: TabBarView(            children: choices.map((item) {              return Container(                width: double.infinity,                color: Colors.white70,                child: Padding(                  padding: EdgeInsets.all(16),                  child: ChoiceCard(                    choice: item,                  ),                ),              );            }).toList(),          ),        ));  }}//ChoiceCard将数据渲染到Card卡片组件上class ChoiceCard extends StatelessWidget {  final Choice choice;  const ChoiceCard({Key key, this.choice}) : super(key: key);  @override  Widget build(BuildContext context) {    //滚动时的卡片小部件    return Card(        color: Colors.blue,        child: Column(          mainAxisAlignment: MainAxisAlignment.center,          children: <Widget>[            Icon(              choice.icon,              size: 120,              color: Colors.white,            ),            Text(choice.title),          ],        ));  }}//数据的类型class Choice {  const Choice({this.title, this.icon});  final String title;  final IconData icon;}//模拟的数据const List<Choice> choices = const <Choice>[  const Choice(title: 'CAR', icon: Icons.directions_car),  const Choice(title: 'BICYCLE', icon: Icons.directions_bike),  const Choice(title: 'BOAT', icon: Icons.directions_boat),  const Choice(title: 'BUS', icon: Icons.directions_bus),  const Choice(title: 'TRAIN', icon: Icons.directions_railway),  const Choice(title: 'WALK', icon: Icons.directions_walk),];

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