Flutter

Question

我有一个带按钮的对话框，我想在按钮旁边添加一个水平滚动条，所以这样按钮固定在左边，滚动条在右边。我尝试使用行，但出现以下错误：

The following assertion was thrown during performResize(): Horizontal viewport was given unbounded width. . . . The following assertion was thrown during performLayout(): RenderBox was not laid out: RenderViewport#48cb5 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE 'package:flutter/src/rendering/box.dart': Failed assertion: line 1982 pos 12: 'hasSize' . . .

我使用的具体代码如下：

      SizedBox(
              height: 80,
              child: Row(
                children: <Widget>[
                  AddUsersButton(newTaskCubit: newTaskCubit),
                  SizedBox(
                    height: 80,
                    child: ListView(
                      scrollDirection: Axis.horizontal,
                      children: <Widget>[
                        UserExample(newTaskCubit: newTaskCubit),
                        UserExample(newTaskCubit: newTaskCubit),
                        UserExample(newTaskCubit: newTaskCubit),
                        UserExample(newTaskCubit: newTaskCubit),
                      ],
                    ),
                  )
                ],
              ),
            ),

Answer 1

您可以在 ListView

上使用 shrinkWrap: true,

SizedBox(
  height: 80,
  child: ListView(
    shrinkWrap: true,
    scrollDirection: Axis.horizontal,
    children: <Widget>[....],
  ),

您可以查看更多关于

Answer 2

也给 SizeBox() width 并使用 shrikWrap 和你的 Listview 。因为卷轴是 Horizontal 它要求你一个固定的 widht.

Flutter - 水平滚动旁边的固定按钮

Flutter - Fixed button next to horizontal scroll

dart

flutter-layout