我正在构建一个页面,动态地生成一些视图.在我的情况下,显示的列表将根据用户输入(用作过滤器)进行更新.
当使用Text Widget进行动态渲染时,一切都运行得很好,但是当我尝试切换到Column或Gridview时,一切都出错并且出现了下面的错误
The following assertion was thrown building ServerGrid(dirty; state: _ServerGridState#59211289()):
I/flutter (14351): setState() or markNeedsBuild() called during build.
I/flutter (14351): This Overlay widget cannot be marked as needing to build because the framework is already in the
I/flutter (14351): process of building widgets. A widget can be marked as needing to be built during the build phase
I/flutter (14351): only if one of its ancestors is currently building. This exception is allowed because the framework
I/flutter (14351): builds …我收到此错误：
I/flutter (29346): ??? EXCEPTION CAUGHT BY WIDGETS LIBRARY ????????????????????????????????????????????????????????????
I/flutter (29346): The following assertion was thrown building MainLogic(dirty, state: _MainLogic#9c794):
I/flutter (29346): setState() or markNeedsBuild() called during build.
I/flutter (29346): This InhWidget widget cannot be marked as needing to build because the framework is already in the
I/flutter (29346): process of building widgets. A widget can be marked as needing to be built during the build phase
I/flutter (29346): only if one of its ancestors is currently building. This …我正在尝试将容器插入叠加层，但是此代码出现错误。
class _MyHomePageState extends State<MyHomePage> {
@override
void didChangeDependencies() {
super.didChangeDependencies();
final entry = OverlayEntry(builder: (BuildContext overlayContext) {
return Container(
height: 50.0,
width: 50.0,
color: Colors.blue,
);
});
_addOverlay(entry);
}
void _addOverlay(OverlayEntry entry) async {
Overlay.of(context).insert(entry);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flutter'),
),
body: Center(),
);
}
}
这是错误
在构建期间调用setState（）或markNeedsBuild（）。不能将此Overlay小部件标记为需要构建，因为框架已在构建小部件的过程中。仅当其某个祖先当前正在构建窗口小部件时，才可以将其标记为需要在构建阶段中构建。允许使用此异常是因为该框架在子代之前构建父窗口小部件，这意味着将始终构建脏后代。否则，框架可能在此构建阶段无法访问此小部件。
先感谢您。