我有一个应用栏,我想要标题,然后旁边有一个凸起的按钮,可以展开以填充剩余的水平空间。我试过这个变种:
AppBar(
title: Row(
children: [
Text("Select view"),
// the row that follows is because it says Expanded widgets
// should be put directly in Row or Column or Flex
Padding(padding: EdgeInsets.only(left: 12.0), child: Row(children: [
Expanded(child: RaisedButton(
child: Text("view 1"),
onPressed: () {
// something
},
),),
])),
]
),
);
为此,我收到以下错误:
I / flutter(26477):在performLayout()期间抛出以下断言:
I / flutter(26477):_ToolbarLayout自定义multichild布局委托忘记布置以下子项:
I / flutter(26477):_ ToolbarSlot.middle:RenderSemanticsAnnotations#6d937 NEEDS-LAYOUT NEEDS-PAINT
I / flutter(26477):_ ToolbarSlot.middle:RenderSemanticsAnnotations#7fcd5 NEEDS-LAYOUT NEEDS-PAINT
I / flutter(26477):_ ToolbarSlot.middle:RenderSemanticsAnnotations#f9a7a NEEDS-LAYOUT NEEDS-PAINT
I / flutter(26477):_ ToolbarSlot.middle:RenderSemanticsAnnotations#ce1f2 NEEDS-LAYOUT NEEDS-PAINT
I / flutter(26477):每个孩子必须布置一次。
我尝试过的每一件事也都抛出了一些断言异常。我真的不在乎我是怎么做的,我只想要两个小部件 - 标题和旁边的RaisedButton
填充应用栏中的其余空间。
只需删除包含RaisedButton
的行
appBar: AppBar(
title: Row(children: [
Text("Select view"),
Expanded(
child: RaisedButton(
child: Text("view 1"),
onPressed: () {
// something
},
),
),
]),
),