另一个异常被抛出: RenderBox未被布局: CustomRenderShrinkWrappingViewport#f6727 relayoutBoundary=up17 RenderBox was -COMPOSITING

Question

我需要横向生成一个列表。但是，我面临以下问题：

引发异常时正在处理下列RenderObject : CustomRenderShrinkWrappingViewport#f6727 relayoutBoundary=up17需要-布局需要-绘制需要-组合-位-更新:需要复合创建者: CustomShrinkWrappingViewport←IgnorePointer#952f0语义处理程序_GestureSemantics CustomShrinkWrappingViewport RawGestureDetector-LabeledGlobalKey#f0fc 7-relayoutBoundary=up17侦听器_ScrollableScope _ScrollSemantics-GlobalKey#c0651 RepaintBoundary CustomPaint RepaintBoundary parentData：(可使用大小)约束: BoxConstraints(0.0<=w<=331.2，0.0<=h<=Infinity)大小:丢失axisDirection: right crossAxisDirection: down偏移：(偏移:0.00，范围: null..null，viewport: null，ScrollableState，ClampingScrollPhysics -> RangeMaintainingScrollPhysics，IdleScrollActivity#d7dd2ScrollDirection.idle)锚: 0.0此RenderObject具有以下后代(显示深度5)：子0: RenderSliverPadding#963bb需要-布局需要-绘制需要-组合位-更新子- RenderSliverList#5357f需要-布局需要-绘制子需求-布局需要-绘制需要-组合-位- RenderSliverList#6db77需要-布局需要-油漆════════════════════════════════════。════════════════════════════════════════════════════════════════

另一个异常被抛出: RenderBox未被布局: CustomRenderShrinkWrappingViewport#f6727 relayoutBoundary=up17 RenderBox was -COMPOSITING BITS UPDATE。

代码是：

CustomScrollView(
      // physics: ScrollPhysics(),
      scrollDirection: Axis.vertical,

      slivers: [
        SliverList(
          delegate: SliverChildBuilderDelegate(
            (context, index) => ScrollablePositionedList.builder(
              shrinkWrap: true,
              scrollDirection: Axis.horizontal,
              itemScrollController: _scrollController,
              itemCount: dummyQuestions.length,
              itemBuilder: (context, index) {
              currentPageIndex = index;
              return dummyQuestions[index];
              },
            ),
          ),
        ),
      ],
    ),

Answer 1

请参阅以下守则：

CustomScrollView(
      controller: scrollController,
      scrollDirection: Axis.horizontal,
      slivers: <Widget>[
        SliverList(
          delegate: SliverChildBuilderDelegate(
            (_, int index) {
             return Container(
             child: Text(list[index]['index'],),
             );
            },
            childCount: list.length,
          )
        ),
      ],
    ))