我需要幫助來解決這個問題。展開后會渲染孩子，但不會展開。
return Scaffold(
body: ListView(
children: [
_HomeBody(child: child,)
],
)
);
_HomeBody
return Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height
child: Column(
children: [
AppBarMenu(),
Expanded(child: child), // A RenderFlex overflowed by 1246 pixels on the bottom.
Footer()
],
),
);
錯誤輸出
══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during layout:
A RenderFlex overflowed by 1246 pixels on the bottom.
The relevant error-causing widget was:
Column
lib\…\views\home_view.dart:19
The overflowing RenderFlex has an orientation of Axis.vertical.
The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
RenderFlex to fit within the available space instead of being sized to their natural size.
This is considered an error condition because it indicates that there is content that cannot be
seen. If the content is legitimately bigger than the available space, consider clipping it with a
ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex,
like a ListView.
The specific RenderFlex in question is: RenderFlex#90f9f OVERFLOWING:
needs compositing
creator: Column ← ConstrainedBox ← Container ← HomeView ← Builder ←
RepaintBoundary-[GlobalKey#97a2c] ← IgnorePointer ← AnimatedBuilder ← FractionalTranslation ←
SlideTransition ← AnimatedBuilder ← RepaintBoundary ← ?
parentData: <none> (can use size)
constraints: BoxConstraints(w=966.0, h=840.0)
size: Size(966.0, 840.0)
direction: vertical
mainAxisAlignment: start
mainAxisSize: max
crossAxisAlignment: start
textDirection: ltr
verticalDirection: down
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uj5u.com熱心網友回復：
您不能Expanded在滾動視圖內部（SignleChildScrollView,ListView等）
像這樣的原因，您是在告訴展開后的孩子占用您允許的整個垂直空間，而滾動視圖可以允許無限的垂直空間，所以簡而言之，您是在告訴孩子Expanded采取無限大的大小。希望這可以澄清錯誤
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/473889.html
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