这是我的代码:

@override
Widget build(BuildContext context) {
  return new Material(
    color: Colors.deepPurpleAccent,
    child: new Column(
     mainAxisAlignment: MainAxisAlignment.center,
        children:<Widget>[new GridView.count(crossAxisCount: _column,children: new List.generate(_row*_column, (index) {
          return new Center(
              child: new CellWidget()
          );
        }),)]
    )
  );
}

例外情况如下:

I/flutter ( 9925): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 9925): The following assertion was thrown during performResize():
I/flutter ( 9925): Vertical viewport was given unbounded height.
I/flutter ( 9925): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
I/flutter ( 9925): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter ( 9925): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter ( 9925): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter ( 9925): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter ( 9925): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size
I/flutter ( 9925): the height of the viewport to the sum of the heights of its children.
I/flutter ( 9925): 
I/flutter ( 9925): When the exception was thrown, this was the stack:
I/flutter ( 9925): #0      RenderViewport.performResize.<anonymous closure> (package:flutter/src/rendering/viewport.dart:827:15)
I/flutter ( 9925): #1      RenderViewport.performResize (package:flutter/src/rendering/viewport.dart:880:6)
I/flutter ( 9925): #2      RenderObject.layout (package:flutter/src/rendering/object.dart:1555:9)

当前回答

加上这两行

ListView.builder ( scrollDirection: Axis.vertical, 收缩包装:没错,

...

其他回答

我想发布另一个答案,因为许多答案(包括已接受的答案!)建议在ListView.builder中使用shrinkWrap: true。虽然这消除了错误,但在这种情况下,由于性能原因,这种解决方案并不理想。Flutter设计了无限大小的ListView,专门在必要时阻止这种行为!

收缩包装滚动视图的内容比展开到允许的最大大小要昂贵得多,因为内容可以在滚动期间展开和收缩,这意味着每当滚动位置发生变化时,都需要重新计算滚动视图的大小。

在某些情况下/设备,这个属性导致故障滚动和动画滞后在我的项目。即使延迟不明显,这个属性也会影响滚动性能。

OP显示他正在为ListView创建一个小(有限)数量的子节点。如果我们想要解决这些列表的错误,谷歌建议使用一个Flexible小部件,即在列表本身上使用Expanded(带有flex 1的Flexible)。

Expanded(
    child: ListView(
        ...
    ),
) 

这里还有其他布局问题,但垂直视口无界高度是因为ListView没有一个限制其大小的父类。

您也可以将Expanded()作为该小部件的父部件。

我做了一个自定义函数来解决你的问题。 你可以直接在你的代码库中使用这个函数:

Widget horizontalListView(height, width, color, child, margin) {
return Column(
  children: [
    SizedBox(
      height: 200,
      child: ListView.builder(
        itemCount: 10,
        shrinkWrap: true,
        scrollDirection: Axis.horizontal,
        itemBuilder: (context,index) {
          return Container(
            height: height,
            width: width,
            margin: EdgeInsets.all(margin),
            color: color,
            child: child
          );
        }
      ),
    ),
  ],
 );
})

附注:对不起,代码对齐不好。

只是想添加我的解决方案,在我的情况下,我有垂直列表视图与其他按钮和文本在同一屏幕上:

Flexible(
child:  
  ListView.builder(
  // make sure to add the following lines:  
  shrinkWrap: true,
  physics: ScrollPhysics(),
  // the rest of your list view code
 ) // ListView
) // Flexible

这个解决方案工作得很好,特别是当您在同一屏幕上有其他小部件时。在这种特殊情况下,仅使用“Expand”或“Flexible”是行不通的。

加上这两行

ListView.builder ( scrollDirection: Axis.vertical, 收缩包装:没错,

...