如何解决在Flutter中，当我在脚手架中添加ListView时会出现问题
我是陌生的，试图将一个列表视图添加到我的一条路线中，当单击该列表时，将我带到特定于每个列表卡的新路线。
这是我的路线代码：
class SecondRoute extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.transparent,appBar: AppBar(
title: Text('What you are in the mood for?'),backgroundColor: Colors.lightGreen[400],centerTitle: true,),body: Column(mainAxisAlignment: MainAxisAlignment.spaceEvenly,children: [
Text('Select a genre:',textAlign: TextAlign.center,style: TextStyle(
fontSize: 40,color: Colors.black,fontWeight: FontWeight.bold)),//if I add ListView(...) here,I get errors
]),);
}
}
我收到的问题是：
════════ Exception caught by rendering library ═════════════════════════════════════════════════════
Tried to paint a RenderObject reentrantly.
The relevant error-causing widget was:
Scaffold file:///Users/User/AndroidStudioProjects/choose_a_game_for_me/lib/main.dart:102:12
════════════════════════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by rendering library ═════════════════════════════════════════════════════
The following assertion was thrown during paint():
Tried to paint a RenderObject reentrantly.
The following RenderObject was already being painted when it was painted again: RenderFlex#aafa2 relayoutBoundary=up5
... needs compositing
... parentData: offset=Offset(0.0,0.0); id=_ScaffoldSlot.body (can use size)
... constraints: BoxConstraints(0.0<=w<=411.4,0.0<=h<=603.4)
... size: MISSING
... direction: vertical
... mainAxisAlignment: spaceEvenly
... mainAxisSize: max
... crossAxisAlignment: center
... verticalDirection: down
Since this typically indicates an infinite recursion,it is disallowed.
The relevant error-causing widget was:
Scaffold file:///Users/Users/AndroidStudioProjects/choose_a_game_for_me/lib/main.dart:102:12
When the exception was thrown,this was the stack:
#0 RenderObject._paintWithContext.<anonymous closure> (package:flutter/src/rendering/object.dart:2208:9)
#1 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2221:6)
#2 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:184:13)
#3 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2515:15)
#4 RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:404:5)
...
The following RenderObject was being processed when the exception was fired: RenderCustomMultiChildLayoutBox#8a3f0 relayoutBoundary=up4
... needs compositing
... parentData: <none> (can use size)
... constraints: BoxConstraints(0.0<=w<=411.4,0.0<=h<=683.4)
... size: Size(411.4,683.4)
RenderObject: RenderCustomMultiChildLayoutBox#8a3f0 relayoutBoundary=up4
needs compositing
parentData: <none> (can use size)
constraints: BoxConstraints(0.0<=w<=411.4,0.0<=h<=683.4)
size: Size(411.4,683.4)
... child 1: RenderFlex#aafa2 relayoutBoundary=up5
... needs compositing
... parentData: offset=Offset(0.0,0.0); id=_ScaffoldSlot.body (can use size)
... constraints: BoxConstraints(0.0<=w<=411.4,0.0<=h<=603.4)
... size: MISSING
... direction: vertical
... mainAxisAlignment: spaceEvenly
... mainAxisSize: max
... crossAxisAlignment: center
... verticalDirection: down
... child 1: RenderParagraph#e94b7 relayoutBoundary=up6 NEEDS-PAINT
... parentData: offset=Offset(0.0,0.0); flex=null; fit=null (can use size)
... constraints: BoxConstraints(0.0<=w<=411.4,0.0<=h<=Infinity)
... size: Size(343.0,47.0)
... textAlign: center
... textDirection: ltr
... softWrap: wrapping at box width
... overflow: clip
... locale: en_US
... maxLines: unlimited
... text: TextSpan
... debugLabel: ((englishLike body1 2014).merge(blackMountainView bodyText2)).merge(unknown)
... inherit: false
... color: Color(0xff000000)
... family: Roboto
... size: 40.0
... weight: 700
... baseline: alphabetic
... decoration: TextDecoration.none
... "Select a genre:"
... child 2: RenderRepaintBoundary#02cc2 relayoutBoundary=up6 NEEDS-PAINT
... needs compositing
... parentData: offset=Offset(0.0,0.0<=h<=Infinity)
... size: MISSING
... usefulness ratio: no metrics collected yet (never painted)
... child: RenderCustomPaint#cd675 relayoutBoundary=up7 NEEDS-PAINT
... needs compositing
... parentData: <none> (can use size)
... constraints: BoxConstraints(0.0<=w<=411.4,0.0<=h<=Infinity)
... size: MISSING
... child: RenderRepaintBoundary#1d1e0 relayoutBoundary=up8 NEEDS-PAINT
... needs compositing
... parentData: <none> (can use size)
... constraints: BoxConstraints(0.0<=w<=411.4,0.0<=h<=Infinity)
... size: MISSING
... usefulness ratio: no metrics collected yet (never painted)
... child 2: RenderConstrainedBox#4a2e7 relayoutBoundary=up5 NEEDS-PAINT
... needs compositing
... parentData: offset=Offset(0.0,0.0); id=_ScaffoldSlot.appBar (can use size)
... constraints: BoxConstraints(w=411.4,0.0<=h<=683.4)
... size: Size(411.4,80.0)
... additionalConstraints: BoxConstraints(0.0<=w<=Infinity,0.0<=h<=80.0)
... child: RenderSemanticsAnnotations#997db relayoutBoundary=up6 NEEDS-PAINT
... needs compositing
... parentData: <none> (can use size)
... constraints: BoxConstraints(w=411.4,0.0<=h<=80.0)
... semantic boundary
... size: Size(411.4,80.0)
... child: RenderAnnotatedRegion<SystemUiOverlayStyle>#e6930 relayoutBoundary=up7 NEEDS-PAINT
... needs compositing
... parentData: <none> (can use size)
... constraints: BoxConstraints(w=411.4,0.0<=h<=80.0)
... size: Size(411.4,80.0)
... child: RenderPhysicalModel#35a1a relayoutBoundary=up8 NEEDS-PAINT
... needs compositing
... parentData: <none> (can use size)
... constraints: BoxConstraints(w=411.4,0.0<=h<=80.0)
... size: Size(411.4,80.0)
... elevation: 4.0
... color: Color(0xff9ccc65)
... shadowColor: Color(0xff9ccc65)
... shape: BoxShape.rectangle
... borderRadius: BorderRadius.zero
... child 3: RenderStack#16a71 NEEDS-LAYOUT NEEDS-PAINT
... parentData: offset=Offset(0.0,0.0); id=_ScaffoldSlot.floatingActionButton
... constraints: MISSING
... size: MISSING
... alignment: centerRight
... textDirection: ltr
... fit: loose
... overflow: clip
... child 1: RenderTransform#68acc NEEDS-LAYOUT NEEDS-PAINT
... parentData: not positioned; offset=Offset(0.0,0.0)
... constraints: MISSING
... size: MISSING
... transform matrix: [0] 0.0,0.0,0.0
[1] 0.0,0.0
[2] 0.0,1.0,0.0
[3] 0.0,1.0
... origin: null
... alignment: center
... textDirection: ltr
... transformHitTests: true
... child: RenderTransform#9de5f NEEDS-LAYOUT NEEDS-PAINT
... parentData: <none>
... constraints: MISSING
... size: MISSING
... transform matrix: [0] 0.7,0.7,0.0
[1] -0.7,1.0
... origin: null
... alignment: center
... textDirection: ltr
... transformHitTests: true
════════════════════════════════════════════════════════════════════════════════════════════════════
我尝试使ListView成为其自己的类，然后将其添加到SecondRoute的主体中，但是仍然出现相同的错误。
第102行是SecondRoute类中的脚手架。
感谢您的帮助
解决方法
如果您尝试在列中添加ListView，则必须将其包装在展开的内容中，如下所示：
Column(
children: [
...
Expanded(
child: ListView(...),),]
)
这是因为ListView将尝试占用所有可用空间，但会导致RenderFlex溢出。本质上，扩展小部件告诉ListView占用所有可用空间，然后向下滚动到无法容纳在Column内的其余空间。
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