我正在尝试制作动画，当我滚动listview时，如果listview的偏移量大于100，则HomePageTop小部件会缩小。 动画可以正常工作，但在动画结束时会显示renderflex溢出错误。
class HomePageView extends StatefulWidget {
@override
_HomePageViewState createState() => _HomePageViewState();
}
class _HomePageViewState extends State<HomePageView> {
ScrollController scrollController = ScrollController();
bool closeTopContainer = false;
@override
void initState() {
super.initState();
scrollController.addListener(() {
setState(() {
closeTopContainer = scrollController.offset > 100;
});
});
}
@override
Widget build(BuildContext context) {
final Size size = MediaQuery.of(context).size;
return Scaffold(
backgroundColor: Color.fromRGBO(235, 236, 240, 1),
body: Container(
height: size.height,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
AnimatedContainer(
color: Colors.redAccent,
width: size.width,
duration: const Duration(milliseconds: 200),
height: closeTopContainer ? 0 : size.width * .33,
child: HomePageTop(
size: size,
)),
Expanded(
child: ListView(
controller: scrollcontroller),
],
),
),
);
}
}
在这里，动画容器的大小由列表视图滚动控制器控制。 每当我向下滚动时，会出现以下错误
错误
The following assertion was thrown during layout:
A RenderFlex overflowed by 5.4 pixels on the bottom.
The relevant error-causing widget was:
Column file:///D:/flutter/app/app/lib/views/Widgets/widgets.dart:94:12
The overflowing RenderFlex has an orientation of Axis.vertical.
The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
black striped pattern. This is usually caused by the contents being too big for the RenderFlex.
Consider applying a flex factor (e.g. using an Expanded widget) to force the children of the
RenderFlex to fit within the available space instead of being sized to their natural size.
The specific RenderFlex in question is: RenderFlex#a37e0 OVERFLOWING:
needs compositing
creator: Column ← HomePageTop ← DecoratedBox ← ConstrainedBox ← Container ← AnimatedContainer ← Flex
← ConstrainedBox ← Container ← _BodyBuilder ← MediaQuery ← LayoutId-[<_ScaffoldSlot.body>] ← ⋯
parentData: <none> (can use size)
constraints: BoxConstraints(w=470.2, h=49.6)
size: Size(470.2, 49.6)
direction: vertical
mainAxisAlignment: start
mainAxisSize: min
crossAxisAlignment: center
verticalDirection: down
我的主页顶部组件
Widget build(BuildContext context) {
return Column(
children: [
SizedBox(
height: 55,
),
Expanded(
child: Stack(children: [
Positioned(right: 20, child: FittedBox(fit:BoxFit.fill,child: LogoutButton())),
Positioned(
top: 50,
child: Container(
alignment: Alignment.topCenter,
padding: EdgeInsets.all(20),
width: size.width,
child: searchField())),
]),
),
],
);
}
用"expanded"包装动画容器可以解决错误，但是大小减小的动画不会发生。 "searchField()"是一个文本字段。把它包装在一个"fittebox"中也会出错。 欢迎任何帮助。提前感谢。