垂直视口高度为无界

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

如果你使用CustomScrollView

你可以试试SliverFillRemaining

2022-04-05 13:51:56

其他回答

有很多答案，但每一个都有自己的局限性。每个人都在说使用shrinkWrap:没错。是的，你应该使用它，但这些代码的效果是，当你滚动列表时，它会自动移动到顶部项目，这意味着滚动回顶部。所以完美的解决方案是使用物理收缩包装，只有列表才能顺利滚动。

      shrinkWrap: true,          //
      physics: ScrollPhysics(),  // both line is mandatory

如果你想看Listview的其他例子。生成器与列作为子和列表可以垂直滚动，然后你可以看到这里的例子-在垂直列表中排列多个文本。

2021-06-23 07:18:57

将网格视图放置在Flexible或Expanded小部件内

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

2018-09-04 18:27:43

测试第二个列表视图

ListView.builder(
            physics: NeverScrollableScrollPhysics(),

2020-07-11 08:49:01

虽然shrinkWrap可以做到，但你不能在ListView中滚动。

如果你想要滚动功能，你可以添加物理属性:

ListView.builder(
    scrollDirection: Axis.vertical,
    shrinkWrap: true,
    physics: ScrollPhysics(),
...

2020-05-15 13:42:15

也会遇到这种错误，因为代码是这样的

return Container(
      child: Column(
        children: [
          ListView.separated(
              itemBuilder: (context, index) {
                return CircleManagerSettingItem(widget.membersInfo[index]);
              },
              separatorBuilder: (_, index) => DD(
                    height: 1,
                    paddingLeft: 10,
                    paddingRight: 10,
                  ),
              itemCount: (widget.membersInfo.length)),
        ],
      ),
    );

删除容器内的列，然后确定。

2021-10-13 10:00:54

垂直视口高度为无界

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