我是 flutter 框架的新手，我想使用 CustomLists。 我的 (body:) 我想将 listviewBuilder 添加到 Column 中，但我给出了一个空白页面。如果我在正文部分只使用 listView，一切都很好。

这是我的小部件:

Widget _buildListView() {
    return ListView.builder(itemBuilder: (BuildContext context, int index) {
      return Dismissible(
        key: Key('ke'),
        onDismissed: (DismissDirection direction) {
          if (direction == DismissDirection.endToStart) {
            print('Swiped end to start');
          } else if (direction == DismissDirection.startToEnd) {
            print('Swiped start to end');
          } else {
            print('Other swiping');
          }
        },
        background: Container(
          color: Colors.red,
        ),
        child: Container(
            child: Column(
          children: <Widget>[
            Row(
              children: <Widget>[
                Expanded(
                  child: Column(children: <Widget>[
                    Row(
                      children: <Widget>[
                        Container(
                          margin: EdgeInsets.symmetric(
                              horizontal: 8.0, vertical: 2.0),
                          padding: EdgeInsets.all(4.0),
                          color: Colors.red,
                          child: Text('12'),
                        ),
                        SizedBox(
                          width: 8.0,
                        ),
                        Text('135'),
                      ],
                    )
                  ]),
                ),
                Expanded(
                  child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        Row(
                          children: <Widget>[
                            Container(
                              color: Colors.green,
                              width: 15,
                              height: 10,
                            ),
                            SizedBox(
                              width: 5,
                            ),
                            Text('120'),
                            SizedBox(
                              width: 5,
                            ),
                            Container(
                              color: Colors.yellow,
                              width: 15,
                              height: 10,
                            ),
                          ],
                        )
                      ]),
                ),
                Expanded(
                    child: Column(
                        mainAxisAlignment: MainAxisAlignment.end,
                        children: <Widget>[
                      Text('30'),
                    ])),
              ],
            ),
            Divider()
          ],
        )),
      );
    },itemCount: 10,);
  }

我得到这个错误:

The following assertion was thrown during performResize():

I/flutter (14466): Vertical viewport was given unbounded height.

I/flutter (14466): Viewports expand in the scrolling direction to fill their container.In this case, a vertical

I/flutter (14466): viewport was given an unlimited amount of vertical space in which to expand. This situation

I/flutter (14466): typically happens when a scrollable widget is nested inside another scrollable widget.

I/flutter (14466): If this widget is always nested in a scrollable widget there is no need to use a viewport because

I/flutter (14466): there will always be enough vertical space for the children. In this case, consider using a Column

I/flutter (14466): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size

I/flutter (14466): the height of the viewport to the sum of the heights of its children. 

最佳答案

为 ListView 添加 shr​​inkWrap 属性 true。

ListView.builder(
shrinkWrap:true,
itemBuilder: (BuildContext context, int index) {
 return Container();
});

关于flutter - ListView 不能作为 Column 或 Row 的子项，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57151388/