颤动的 TabBarView 有时不会在手势滑动时触发

Question

我正在使用 Flutter -Android studio。我有带 TabBarView 控件的主屏幕（2 页）。每个页面都从 sqfite 数据库中获取数据。两者都有相同的有状态小部件 class，但我传递参数以查看数据库和显示。问题：当我单击 tabbar header 时，显示的数据正常。但是当我滑动标签时，它有时有效，有时无效。按照下面的视频。我已经检查过，如果完成滑动，似乎构建事件不会每次都触发。带 tabbarview 的主要小部件

screen record

Note that 1st tab has only 1 record, while second has 6 records. tabClick works fine, but swipe sometime not work properly.

body: TabBarView(
    controller: _tabController,
    children: [
      DisplayTransactions(
        tmptransType: TransactionType.enIncome,
        transacBloc: _transacBloc,
        SelectedItemsCount: bRowSelectionCount,
        onSelectionChanged: (count) {
          setState(() {
            bRowSelectionCount = count;
          });
        },
      ),
      // Center(child: Text("Page 1")),
      DisplayTransactions(
        tmptransType: TransactionType.enExpense,
        transacBloc: _transacBloc,
        SelectedItemsCount: bRowSelectionCount,
        onSelectionChanged: (count) {
          setState(() {
            bRowSelectionCount = count;
          });
        },
        //Center(child: Text("Page 2")),
      )
    ],
  ),

------ > 将数据显示到每个标签栏页面的列表视图中的小部件

class DisplayTransactions extends StatefulWidget {
final TransactionType tmptransType;
final FinanceTransBlock transacBloc;
final Function onSelectionChanged;
int SelectedItemsCount;

/// -1 expense  1 income
DisplayTransactions(
{Key key,
@required this.tmptransType,
@required this.transacBloc,
this.SelectedItemsCount,
this.onSelectionChanged})
: super(key: key);

@override
_DisplayTransactionsState createState() => _DisplayTransactionsState();
}

class _DisplayTransactionsState extends State<DisplayTransactions> {
var isSelected = false;
var mycolor = Colors.white;

// int iselectionCount = 0;


@override
Widget build(BuildContext context) {
widget.transacBloc.transacType = widget.tmptransType;
debugPrint("----------------------------- ${widget.tmptransType}");
if (widget.SelectedItemsCount == 0) {// if no rows selected, then reload database based on trans type, eg expense, or income.. etc
widget.transacBloc.refresh();
}

return StreamBuilder<List<FinanceTransaction>>(
stream: widget.transacBloc.transacations,
builder: (context, snapshot) {
if (snapshot.hasData) {
List<FinanceTransaction> list = snapshot.data;
// return  buildTaskListWal(snapshot.data);
return Padding(

Answer 1

应用似乎需要一些时间来检索新数据。尝试在 snapshot.data 上检查 null 并显示一个 circularProgressIndicator。

if (snapshot.data == null) {
  return CirgularProgressIndicator();
 } else {
//display data
}

颤动的 TabBarView 有时不会在手势滑动时触发

flutter TabBarView sometimes not triggering on gesture swipe

tabs

swipe

flutter