Flutter：嵌套 ListView 有效。 嵌套的 SliverList 沒有，但 ListView 包含 Sliver

Question

我遇到了一個特定的問題。 我能夠組成一個包含水平ListView的垂直外部ListView 。 將其視為 Facebook 上的多個朋友建議行堆疊在一起。 這工作正常。

因為我想利用SliverAppBar附帶的特權，所以我需要有一個CustomScrollView作為父Widget ，然后在其slivers集合中只添加 slivers。

當我嘗試在SliverChildBuilderDelegate SliverList我得到了各種各樣的錯誤，主要是與渲染相關的類型錯誤。 似乎SliverChildBuilderDelegate可以構建的子類型存在限制。

NEEDS-COMPOSITING-BITS-UPDATE:
  needs compositing
  creator: Viewport ← IgnorePointer-[GlobalKey#a5a09] ← Semantics ← Listener ← _GestureSemantics ←
    RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#db221] ← Listener ← _ScrollableScope
    ← _ScrollSemantics-[GlobalKey#57142] ← Scrollable ← CustomScrollView ← Padding ← ⋯
  parentData: <none> (can use size)
  constraints: BoxConstraints(w=412.0, 0.0<=h<=Infinity)
  size: MISSING
  axisDirection: right
  crossAxisDirection: down
  offset: ScrollPositionWithSingleContext#415a2(offset: 0.0, range: null..null, viewport: null,
    ScrollableState, BouncingScrollPhysics -> RangeMaintainingScrollPhysics, IdleScrollActivity#74aea,
    ScrollDirection.idle)
  anchor: 0.0
This RenderObject had the following child:
    center child: RenderSliverList#5219f NEEDS-LAYOUT NEEDS-PAINT
════════════════════════════════════════════════════════════════════════════════════════════════════

Another exception was thrown: RenderBox was not laid out: RenderViewport#e26b4 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE

Another exception was thrown: RenderBox was not laid out: RenderViewport#e26b4 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE

Another exception was thrown: RenderBox was not laid out: RenderIgnorePointer#e30f7 relayoutBoundary=up10 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE

Another exception was thrown: RenderBox was not laid out: RenderSemanticsAnnotations#d70ab relayoutBoundary=up9 NEEDS-PAINT
NEEDS-COMPOSITING-BITS-UPDATE

如您所見，我嘗試將SliverList包裝在非 sliver 類型的 Widget 中，但無濟於事。

我嘗試使用NestedScrollView解決它，但我不斷收到相同類型的錯誤。

有沒有人遇到過這種情況。 我瀏覽了源代碼，我可以看到ListView基本上是一個帶有內部ScrollView的BoxScrollView 。

我是否需要創建一個專門的 Widget 來完成這個布局設計。 如果是這樣的話，我已經對 Flutter 摸不着頭腦了。

Answer 1

解決了。 我所缺少的只是嵌套SliverList的包含Container中的height和width 。