我正在CupertinoNavigationBar用来制作预期的布局，如下图所示
在左侧/leading区域，我覆盖了默认的后退按钮来创建布局，但是我得到了溢出
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.
我可以扩大领先区域的约束，还是有更好的方法来做到这一点？
谢谢你。