我是Flutter的新手,对于布局方面遇到了一些困难。
一个粘性的标题和它下面的可滚动视图。 我考虑使用Column widget,并将其分为两个子项-第一个是标题,第二个是ListView。
以下是我的代码:
Widget build(BuildContext context) {
return Material(
elevation: 8.0,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(16.0),
child: Text(
title,
style:
Theme.of(context).textTheme.subhead.copyWith(fontSize: 18.0),
textAlign: TextAlign.left,
),
),
Divider(height: 4.0),
ListView.builder(itemBuilder: (context, i) {
return ListTile(
title: Text("Title $i"),
subtitle: Text("Subtitle $i"),
);
}),
],
),
);
}
我对此遇到了以下错误。
I/flutter ( 5725): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 5725): The following assertion was thrown during performResize():
I/flutter ( 5725): Vertical viewport was given unbounded height.
I/flutter ( 5725): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
I/flutter ( 5725): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter ( 5725): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter ( 5725): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter ( 5725): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter ( 5725): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size
I/flutter ( 5725): the height of the viewport to the sum of the heights of its children.
我按照消息中提到的添加了ListView的shrinkWrap属性,但那也没有起作用。
此布局的父级是一个堆栈,其中包含各种这样的布局页面,所有这些布局页面都处于关闭状态,用户选择的页面除外。
我做错了什么?