如果正文包含显式ScrollController，则NestedScrollView中的页头条不会展开或折叠

如何解决如果正文包含显式ScrollController，则NestedScrollView中的页头条不会展开或折叠

创建父滚动控制器，并将其分配给nestedScrollView。并且为每个选项卡的CustomScrollView创建子滚动控制器。这是变量，控制器是通过init方法创建的：

static const tabs = ['One','Two','Three','Four'];

TabController _tabController;
ScrollController _parentScrollController;
Map<String,ScrollController> _childScrollController = Map();

这是构建方法：

@override
  Widget build(BuildContext context) {
    return Refreshindicator(
      onRefresh: () async => await Future.delayed(const Duration(seconds: 1)),child: nestedScrollView(
        controller: _parentScrollController,headerSliverBuilder: (BuildContext context,bool innerBoxIsScrolled) {
          return <Widget>[
            SliverOverlapAbsorber(
              handle: nestedScrollView.sliverOverlapAbsorberHandleFor(context),sliver: SliverAppBar(
                backgroundColor: Colors.green,title: const Text('Tabs with explicit scroll controllers'),actions: [],pinned: true,expandedHeight: 200.0,forceElevated: innerBoxIsScrolled,bottom: TabBar(
                  controller: _tabController,tabs: tabs
                      .map<Widget>((String page) => Tab(text: page))
                      .toList(),),];
        },body: TabBarView(
          controller: _tabController,children: tabs.map<Widget>((String page) {
            return SafeArea(
              top: false,bottom: false,child: Builder(
                builder: (BuildContext context) {
                  return CustomScrollView(
                    // If the controller below is set,AppBar or other header slivers dont expand or collapse
                    // If I remove it,I get the desired effect
                    controller: _childScrollController[page],key: PageStorageKey<String>(page),slivers: <Widget>[
                      SliverOverlapInjector(
                        handle: nestedScrollView.sliverOverlapAbsorberHandleFor(
                            context),SliverFixedExtentList(
                        itemExtent: 100,delegate: SliverChildBuilderDelegate(
                          (BuildContext context,int index) {
                            return Container(
                              alignment: Alignment.center,color: index % 2 == 0
                                  ? Colors.deepPurple[50]
                                  : Colors.blue[100],child: Text("Item $index"),);
                          },childCount: 100,],);
                },);
          }).toList(),);
  }

我之所以假设它是因为两个滚动控制器之间没有直接关系。我尝试为孩子使用PrimaryScrollController.of(context)，但是我需要从外部或在初始位置修改滚动位置。