代码之家 › 专栏 › 技术社区 › MistyD Harish Kumar Kailas

将小部件放置在列中会使RenderIndexedStack对象在布局期间具有无限大小

flutter dart

MistyD Harish Kumar Kailas · 技术社区 · 7 年前

我将以下内容放在这样的专栏中

   Widget _getDropDownCombo()
    {
       Widget combo =  new DropdownButton(
            value: _currentItem,
               items:_dropDownMenuItems,
            onChanged: _changedDropDownItem
            );
       return Flexible(child:combo);
    }

和 _getDropDownCombo 是从这样的地方被叫来的

child: new Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: <Widget>[
                        _getDropDownCombo(),
                        getIcon(),
                    ],)

这给了我一个错误颤振:渲染库捕获异常

flutter: The following assertion was thrown during performLayout():
flutter: RenderIndexedStack object was given an infinite size during layout.
flutter: This probably means that it is a render object that tries to be as big as possible, but it was put
flutter: inside another render object that allows its children to pick their own size.
flutter: The nearest ancestor providing an unbounded width constraint is:
flutter:   RenderFlex#dfcbf relayoutBoundary=up17 NEEDS-LAYOUT NEEDS-PAINT

为什么DropDownButton会出现这个错误?有什么建议吗?

1 回复 | 直到 7 年前

User 7 年前

他们的问题可能是因为下拉按钮中的项目。我试过在物品中使用它,效果很好:

items: ['Foo', 'Bar'].map((String value) {
                    return new DropdownMenuItem(
                      value: value,
                      child: new Text(value),
                    );
                  }).toList(),

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