扩大CupertinoNavigationBar领先领域

时间：2019-07-09 06:16:38

标签： flutter flutter-layout flutter-cupertino

我正在使用CupertinoNavigationBar进行所需的布局，如下图所示

enter image description here

在左侧/ leading区域中，我覆盖了默认的后退按钮以创建布局，但是却出现了溢出

enter image description here 

return CupertinoPageScaffold(
  ...
  leading: Row(
    children: <Widget>[
      UtomoDeckNavigationBar.getDefaultBackButton(context: context, isLightTheme: true),
        Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(widget.chat.name,
              style: TextStyle(
                color: CupertinoColors.black,
                fontWeight: FontWeight.bold,
                fontSize: 14.0)),
            Text('Online',
              style: TextStyle(color: CupertinoColors.black, fontSize: 12.0))
        ],
      )
    ],
  )
)

和错误

Performing hot reload...
Syncing files to device iPhone SE...
flutter: ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
flutter: The following assertion was thrown during layout:
flutter: A RenderFlex overflowed by 34 pixels on the right.
flutter:
flutter: The overflowing RenderFlex has an orientation of Axis.horizontal.
flutter: The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
flutter: black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
flutter: Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
flutter: RenderFlex to fit within the available space instead of being sized to their natural size.
flutter: This is considered an error condition because it indicates that there is content that cannot be
flutter: seen. If the content is legitimately bigger than the available space, consider clipping it with a
flutter: ClipRect widget before putting it in the flex, or using a scrollable container rather than a Flex,
flutter: like a ListView.
flutter: The specific RenderFlex in question is: RenderFlex#d650f relayoutBoundary=up2 OVERFLOWING:
flutter:   creator: Row ← IconTheme ← Builder ← Padding ← KeyedSubtree-[GlobalKey#fab21 Leading] ←
flutter:     LayoutId-[<_ToolbarSlot.leading>] ← CustomMultiChildLayout ← NavigationToolbar ← Padding ←
flutter:     MediaQuery ← Padding ← SafeArea ← ⋯
flutter:   parentData: offset=Offset(16.0, 0.0) (can use size)
flutter:   constraints: BoxConstraints(0.0<=w<=90.7, h=44.0)
flutter:   size: Size(90.7, 44.0)
flutter:   direction: horizontal
flutter:   mainAxisAlignment: start
flutter:   mainAxisSize: max
flutter:   crossAxisAlignment: center
flutter:   textDirection: ltr
flutter:   verticalDirection: down
flutter: ◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤◢◤
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════
Reloaded 11 of 687 libraries in 407ms.

我可以扩大领先地区的约束范围吗，或者有更好的方法可以做到这一点？

谢谢。

1 个答案:

答案 0 :(得分：0)

为解决此问题，我在Row内使用MainAxisAlignment.start和middle而不是leading。

编辑：

将Container与无穷大width一起使用，而不是Row，如果其子控件大于父（Row），则其子控件会溢出，而TextOverflow.ellipsis不会帮助

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