扑。列 mainAxisAlignment spaceBetween 在行内不起作用

Question

我正在尝试制作这样的屏幕：

为此，我将 ListView 与自定义项一起使用。 这是我的商品代码：

  @override
  Widget build(BuildContext context) {
    return Padding(
        padding: const EdgeInsets.all(10),
        child: Card(
          elevation: 5,
          color: Colors.greenAccent,
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(6)),
          child: Padding(
            padding: const EdgeInsets.all(12.0),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Row(
                  mainAxisAlignment: MainAxisAlignment.start,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    SizedBox(
                      width: 65,
                      height: 65,
                      child: ClipRRect(
                          borderRadius: BorderRadius.circular(8),
                          child: Image.asset(
                            "assets/images/temp.png",
                            alignment: Alignment.center,
                          )),
                    ),
                    const SizedBox(width: 18),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: const [
                              Text(
                                "Test title",
                                textAlign: TextAlign.left,
                                style: TextStyle(
                                    color: Colors.red,
                                    fontSize: 17,
                                    fontWeight: FontWeight.w500),
                              ),
                              Text(
                                "TestDescription",
                                style: TextStyle(
                                    color: Colors.deepOrangeAccent,
                                    fontSize: 15,
                                    fontWeight: FontWeight.w700),
                              ),
                            ],
                          ),
                          Spacer(),
                          CustomButton(
                            onPressed: () {},
                          )
                        ],
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ));
  }

我需要将标题和描述对齐到顶部，自定义底部对齐到底部。为此，我在 Column 中使用了 Spacer() 并用 Expanded 小部件包裹了我的 Column。但是当我用 Expanded 包裹我的小部件时，我得到这样的错误：

RenderFlex children have non-zero flex but incoming height constraints are unbounded.

When a column is in a parent that does not provide a finite height constraint, for example if it is in a vertical scrollable, it will try to shrink-wrap its children along the vertical axis. Setting a flex on a child (e.g. using Expanded) indicates that the child is to expand to fill the remaining space in the vertical direction. These two directives are mutually exclusive. If a parent is to shrink-wrap its child, the child cannot simultaneously expand to fit its parent.

Consider setting mainAxisSize to MainAxisSize.min and using FlexFit.loose fits for the flexible children (using Flexible rather than Expanded). This will allow the flexible children to size themselves to less than the infinite remaining space they would otherwise be forced to take, and then will cause the RenderFlex to shrink-wrap the children rather than expanding to fit the maximum constraints provided by the parent.

当我删除 Expanded() 和 Spacer() 时，错误编号。但我有错误的看法。看图片：

请帮我看看我做错了什么(

Answer 1

您可以使用 IntrinsicHeight 作为 Row 的父级以使用 crossAxisAlignment: CrossAxisAlignment.stretch, 获得想要的结果，然后对于 Rows 的子级可以使用 [=14= 换行] 或 Exapnded 小部件。

 @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(10),
      child: Card(
        elevation: 5,
        color: Colors.greenAccent,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(6)),
        child: Padding(
          padding: const EdgeInsets.all(12.0),
          child: IntrinsicHeight(
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Flexible(
                  // or exapnded
                  // fit: FlexFit.tight,
                  flex: 1,
                  child: Container(
                    height: 65,
                    width: 64,
                    color: Colors.amber,
                    child: Text("Image"),
                  ),
                ),
                Flexible(
                  flex: 1,
                  fit: FlexFit.tight,
                  child: Column(
                    mainAxisSize: MainAxisSize.max,
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Column(
                        mainAxisSize: MainAxisSize.min,
                        crossAxisAlignment: CrossAxisAlignment.start,
                        mainAxisAlignment: MainAxisAlignment.start,
                        children: [
                          Text("Item 1"),
                          Text("Item 2"),
                        ],
                      ),
                      Text("Item b x"),
                    ],
                  ),
                ),
                Flexible(
                  flex: 1,
                  // fit: FlexFit.tight,
                  child: Container(
                    color: Colors.cyanAccent,
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      crossAxisAlignment: CrossAxisAlignment.end,
                      children: const [
                        Text("lT"),
                        Text("lBsssssssssssss"),
                      ],
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }