Listview 如何在颤振中同时使用SliverPersistentHeader和TabBarView？

我有一个带有

SliverPersistentHeader

和

TabBarView

的主页，如下代码：

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Theme.of(context).backgroundColor,
      body: DefaultTabController(
        length: 3,
        child: NestedScrollView(
          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
            return <Widget>[
              SliverAppBar(
                expandedHeight: 250.0,
                floating: false,
                pinned: true,
              ),
              SliverPersistentHeader(
                delegate: _SliverAppBarDelegate(
                  TabBar(
                    labelStyle: TextStyle(
                        fontFamily: 'Raleway',
                        fontSize: 17,
                        fontWeight: FontWeight.w400,
                        color: Theme.of(context).backgroundColor),
                    indicatorColor: Theme.of(context).hintColor,
                    labelColor: Theme.of(context).buttonColor,
                    unselectedLabelColor: Theme.of(context).dividerColor,
                    tabs: [
                      Tab(text: "Menu"),
                      Tab(text: "About"),
                      Tab(text: "Contact"),
                    ],
                  ),
                ),
                pinned: true,
              ),
            ];
          },
          body: TabBarView(
            children: <Widget>[MenuTab(), AboutTab(), ContactTab()],
          ),
        ),
      ),
    );
  }
}

class _SliverAppBarDelegate extends SliverPersistentHeaderDelegate {
  _SliverAppBarDelegate(this._tabBar);

  final TabBar _tabBar;

  @override
  double get minExtent => _tabBar.preferredSize.height;

  @override
  double get maxExtent => _tabBar.preferredSize.height;

  @override
  Widget build(
      BuildContext context, double shrinkOffset, bool overlapsContent) {
    return new Container(
      child: _tabBar,
    );
  }

  @override
  bool shouldRebuild(_SliverAppBarDelegate oldDelegate) {
    return false;
  }
}

class _AboutTabState extends State<AboutTab> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        backgroundColor: Theme.of(context).backgroundColor,
        body: ListView(
      children: <Widget>[
        ListView.builder(
          shrinkWrap: true,
          itemCount: _list.length,
          itemBuilder: (BuildContext context, int index) {
            final _aboutList = _list[index];
            return ExpansionTile(
              title: ListTile(
                title: Padding(
                  padding: const EdgeInsets.fromLTRB(5, 0, 0, 0),
                  child: Text(_aboutList.aboutTitle,
                      style: TextStyle(
                          fontFamily: 'Raleway',
                          fontSize: 16,
                          fontWeight: FontWeight.w500,
                          color: Theme.of(context).buttonColor)),
                ),
              ),
              children: <Widget>[
                ListTile(
                  title: Padding(
                    padding: const EdgeInsets.fromLTRB(10, 0, 0, 0),
                    child: Text(_aboutList.content,
                        style: TextStyle(
                            fontFamily: 'Raleway',
                            fontSize: 16,
                            fontWeight: FontWeight.w400,
                            color: Theme.of(context).toggleableActiveColor)),
                  ),
                )
              ],
            );
          },
        ),
      ],
    ));

@覆盖
小部件构建（构建上下文）{
返回脚手架(
背景色：主题。背景色，
正文：DefaultTabController(
长度：3，
子：嵌套滚动视图(
headerSliverBuilder：（BuildContext上下文，boolInnerBoxIsCrolled）{
返回[
滑杆(
扩展高度：250.0，
浮动：假，
对,，
),
滑冰机(
代表：_SliverAppBarDelegate(
塔巴(
标签样式：文本样式(
fontFamily:“Raleway”，
尺寸：17，
fontWeight:fontWeight.w400，
颜色：主题（上下文）。背景色），
指示色：主题（上下文）.hintColor，
标签颜色：主题。背景。按钮颜色，
未选择的标签颜色：主题.of（上下文）.dividerColor，
选项卡：[
选项卡（文本：“菜单”），
选项卡（文本：“关于”），
选项卡（文本：“联系人”），
],
),
),
对,，
),
];
},
正文：选项卡视图(
子项：[MenuTab（）、AboutTab（）、ContactTab（）]，
),
),
),
);
}
}
类_SliverAppBarDelegate扩展SliverPersistentHeaderDelegate{
_SliverAppBarDelegate（此选项卡）；
最终TabBar _TabBar；
@凌驾
double-get-minExtent=>\u tabBar.preferredSize.height；
@凌驾
double get maxExtent=>\u tabBar.preferredSize.height；
@凌驾
小部件构建(
BuildContext上下文、双收缩偏移、布尔重叠内容）{
退回新货柜(
孩子：_tabBar，
);
}
@凌驾
布尔应该重建（\u SliverAppBarDelegate oldDelegate）{
返回false；
}
}

---

之后，我为每个选项卡创建了单个类，例如下面的代码：

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Theme.of(context).backgroundColor,
      body: DefaultTabController(
        length: 3,
        child: NestedScrollView(
          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
            return <Widget>[
              SliverAppBar(
                expandedHeight: 250.0,
                floating: false,
                pinned: true,
              ),
              SliverPersistentHeader(
                delegate: _SliverAppBarDelegate(
                  TabBar(
                    labelStyle: TextStyle(
                        fontFamily: 'Raleway',
                        fontSize: 17,
                        fontWeight: FontWeight.w400,
                        color: Theme.of(context).backgroundColor),
                    indicatorColor: Theme.of(context).hintColor,
                    labelColor: Theme.of(context).buttonColor,
                    unselectedLabelColor: Theme.of(context).dividerColor,
                    tabs: [
                      Tab(text: "Menu"),
                      Tab(text: "About"),
                      Tab(text: "Contact"),
                    ],
                  ),
                ),
                pinned: true,
              ),
            ];
          },
          body: TabBarView(
            children: <Widget>[MenuTab(), AboutTab(), ContactTab()],
          ),
        ),
      ),
    );
  }
}

class _SliverAppBarDelegate extends SliverPersistentHeaderDelegate {
  _SliverAppBarDelegate(this._tabBar);

  final TabBar _tabBar;

  @override
  double get minExtent => _tabBar.preferredSize.height;

  @override
  double get maxExtent => _tabBar.preferredSize.height;

  @override
  Widget build(
      BuildContext context, double shrinkOffset, bool overlapsContent) {
    return new Container(
      child: _tabBar,
    );
  }

  @override
  bool shouldRebuild(_SliverAppBarDelegate oldDelegate) {
    return false;
  }
}

class _AboutTabState extends State<AboutTab> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        backgroundColor: Theme.of(context).backgroundColor,
        body: ListView(
      children: <Widget>[
        ListView.builder(
          shrinkWrap: true,
          itemCount: _list.length,
          itemBuilder: (BuildContext context, int index) {
            final _aboutList = _list[index];
            return ExpansionTile(
              title: ListTile(
                title: Padding(
                  padding: const EdgeInsets.fromLTRB(5, 0, 0, 0),
                  child: Text(_aboutList.aboutTitle,
                      style: TextStyle(
                          fontFamily: 'Raleway',
                          fontSize: 16,
                          fontWeight: FontWeight.w500,
                          color: Theme.of(context).buttonColor)),
                ),
              ),
              children: <Widget>[
                ListTile(
                  title: Padding(
                    padding: const EdgeInsets.fromLTRB(10, 0, 0, 0),
                    child: Text(_aboutList.content,
                        style: TextStyle(
                            fontFamily: 'Raleway',
                            fontSize: 16,
                            fontWeight: FontWeight.w400,
                            color: Theme.of(context).toggleableActiveColor)),
                  ),
                )
              ],
            );
          },
        ),
      ],
    ));

class\u关于bstate扩展状态

函数_SliverAppBarDelegate（）返回一个容器，您可以像这样在其中添加颜色：

class _SliverAppBarDelegate extends SliverPersistentHeaderDelegate {
  _SliverAppBarDelegate(this._tabBar);

  final TabBar _tabBar;

  @override
  double get minExtent => _tabBar.preferredSize.height;
  @override
  double get maxExtent => _tabBar.preferredSize.height;

  @override
  Widget build(
      BuildContext context, double shrinkOffset, bool overlapsContent) {
    return new Container(
      color: Colors.white, // ADD THE COLOR YOU WANT AS BACKGROUND.
      child: _tabBar,
    );
  }

  @override
  bool shouldRebuild(_SliverAppBarDelegate oldDelegate) {
    return false;
  }
}