Question

在运行代码时，我收到一个错误，显示在布局期间错误使用 ParentDataWidget 和 RenderCustomMultiChildLayoutBox 对象被赋予无限大小。

    @override
    Widget build(BuildContext context) {
        return Scaffold(
          body: _column,
        );
      }
  get _column {
    return Column(
      mainAxisSize: MainAxisSize.max,
      crossAxisAlignment: CrossAxisAlignment.center,
      children: <Widget>[
        _setTitleText(Constant.shuffle_drinks, 8),
        _setTop10List(
            list: randomCocktailList,
            height: 150,
            width: 300,
            axis: Axis.horizontal,
            listHeight: 150,
            textSize: 14,
            flag: false),
    Container(
      margin: EdgeInsets.only(left: 16, right: 16),
      child: _ingredientGrid,
    ),
    _setTitleText(Constant.latest_drink, 8),
    _setTop10List(
        list: latestCocktailList,
        height: 150,
        width: 300,
        axis: Axis.horizontal,
        listHeight: 150,
        textSize: 14,
        flag: false),
    _setTitleText("Popular Drinks", 8),
    Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        _setTop10List(
            list: popularCocktailList,
            height: 150,
            width: MediaQuery.of(context).size.width,
            axis: Axis.vertical,
            listHeight: double.maxFinite,
            textSize: 14,
            flag: true),
      ],
    )
  ],
)};

更多代码：

Widget _setTop10List(
      {Future<List<Cocktail>> list,
      double height,
      double width,
      Axis axis,
      double listHeight,
      double textSize,
      bool flag}) {
    if (axis == Axis.vertical) {
      return Column(
        children: [
          Utils.getFutureBuilder(
              list: list,
              height: height,
              width: width,
              axis: axis,
              listHeight: listHeight,
              textSize: textSize,
              flag: flag)
        ],
      );
    } else {
      return Container(
        height: listHeight,
        child: Utils.getFutureBuilder(
            list: list,
            height: height,
            width: width,
            axis: axis,
            listHeight: listHeight,
            textSize: textSize,
            flag: flag),
      );
    }
  }

  Widget _setTitleText(String title, double top) {
    return Container(
      alignment: Alignment.topLeft,
      margin: EdgeInsets.only(left: 16, top: top),
      child: Flexible(
//             alignment: Alignment.topLeft,
        flex: 1,
        child: Text(
          title,
          style: TextStyle(
              color: Colors.black87,
              fontFamily: "Poppins",
              fontSize: 18,
              letterSpacing: 1,
              fontWeight: FontWeight.w600),
        ),
      ),
    );
  }
}

我得到的错误是：

════════ Exception caught by widgets library ═══════════════════════════════════
Incorrect use of ParentDataWidget.
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by rendering library ═════════════════════════════════
RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
The relevant error-causing widget was
Scaffold

Answer 1

你有一个无限高的 Scaffold。这是因为 Home 中的 SomrasMain.dart 小部件将 HomeScreen 放在 SingleChildScrollView 中。

解决此问题的最简单方法是从 Scaffold 中删除 HomeScreen。无论如何你都不需要，因为整个小部件都包含在 Home 中，它已经提供了一个 Scaffold。

Answer 2

用 Expanded 包裹您的 FutureBuilder 并用 Expanded 包裹您的 settopList 方法

Flutter 中 ParentDataWidget 的错误使用

2 个答案: