我有一个TabBarView(),里面包含不同的视图。我想要其中的一个视图是一个顶部有TextField,下面有ListView.Builder()的Column,并且这两个小部件都在同一个可滚动区域(ScrollView)内。但是我实现的方式出现了一些错误:
@override
Widget build(BuildContext context) {
return new Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
new Padding(
padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
child: new TextField(
decoration: new InputDecoration(
hintText: "Type in here!"
),
)
),
new ListView.builder(
itemCount: _posts.length, itemBuilder: _postBuilder)
],
);
}
错误:
I/flutter (23520): The following assertion was thrown during performResize():
I/flutter (23520): Vertical viewport was given unbounded height.
I/flutter (23520): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
I/flutter (23520): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter (23520): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter (23520): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter (23520): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter (23520): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size
I/flutter (23520): the height of the viewport to the sum of the heights of its children.
我读到过在扩展区域中堆叠ListView.builder()的方法,但会导致文本字段有点“粘滞”,这不是我想要的。 :-)
我也尝试使用CustomScrollView,但不是很理解如何实现。