所以我在我的待办事项应用程序中有这个主屏幕，其中待办事项出现在网格视图中，出于某种原因，我的手机屏幕被完全读取，我不断收到以下错误：
'package:flutter/src/widgets/framework.dart': Failed assertion: line 4269 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.
The relevant error-causing widget was
GridView
lib\src\my_app.dart:72
这是我主屏幕上的代码：
class HomeScreen extends StatefulWidget {
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
final TodoDataManager data = TodoDataManager();
final ToDosFilterer filterer = ToDosFilterer();
ScrollController _controller;
double _floatingButtonSize = 60.0;
List allData = [];
@override
void initState() {
super.initState();
_controller = ScrollController();
_controller.addListener(() {
if (_controller.offset >= _controller.position.maxScrollExtent)
setState(() => _floatingButtonSize = 0.0);
else
setState(() => _floatingButtonSize = 60.0);
});
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
// Widget filterdTodosSection(List data, String title) {
// return Column(
// children: [
// TodoCardsList(
// title: title,
// todos: data,
// ),
// SizedBox(height: data.length == 0 ? 0.0 : 40.0),
// ],
// );
// }
@override
Widget build(BuildContext context) {
final todoDataProvider = Provider.of<TodoModel>(context);
final themeProvider = Provider.of<ClrTheme>(context);
final todoSelectedForChangeProvider =
Provider.of<TodoActionSelection>(context);
final selectedTodosProvider =
Provider.of<SelectedTodosProvider>(context, listen: false);
// final cardsRefresherProvider =
// Provider.of<TodoCardsRefresherProvider>(context);
// (cardsRefresherProvider.isRefreshed)
// ? setState(() {
// allData.clear();
// print('good');
// })
// : print("sorry, no setstate");
return WillPopScope(
onWillPop: () {
SystemNavigator.pop();
return Future.value(false);
},
child: Scaffold(
appBar: AppBar(
title: Text(
"todo".toUpperCase(),
style: Theme.of(context).textTheme.headline3,
),
centerTitle: true,
actions: todoSelectedForChangeProvider.isTodoSelected
? [
IconButton(
icon: Icon(Icons.delete,
color: themeProvider.isdarkThemeOn()
? whiteColor
: blackColor),
onPressed: () {},
),
IconButton(
icon: Icon(Icons.edit,
color: themeProvider.isdarkThemeOn()
? whiteColor
: blackColor),
onPressed: () {},
),
]
: [
IconButton(
icon: Icon(Icons.settings,
color: themeProvider.isdarkThemeOn()
? whiteColor
: blackColor),
onPressed: () {
// todoDataProvider.resetAll();
Navigator.pushNamed(context, "/settings");
},
),
],
leadingWidth: 40,
leading: Padding(
padding: const EdgeInsets.only(left: 8.0),
child: todoSelectedForChangeProvider.isTodoSelected
? IconButton(
icon: Icon(Icons.cancel_sharp,
color: themeProvider.isdarkThemeOn()
? whiteColor
: blackColor),
onPressed: () {
todoSelectedForChangeProvider.setTodoSelected = false;
selectedTodosProvider.resetTodosCount();
},
)
: SizedBox.shrink()),
),
floatingActionButton: AnimatedContainer(
duration: Duration(milliseconds: 400),
curve: Curves.easeIn,
width: _floatingButtonSize,
height: _floatingButtonSize,
child: MaterialButton(
elevation: 8.0,
color: Theme.of(context).primaryColor,
child: Text(
"+",
style: TextStyle(fontSize: _floatingButtonSize < 40 ? 0.0 : 40),
),
onPressed: () {
todoDataProvider.resetAll();
Navigator.pushNamed(context, "/todo", arguments: ["add"]).then(
(value) => setState(() {}),
);
},
),
),
drawer: CustomedDrawer(),
body: FutureBuilder(
future: data.getTodoData(),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.hasData) {
allData.clear();
allData.addAll(snapshot.data);
print("alldata from db ${snapshot.data}");
print("alldata not from db $allData");
return snapshot.data.isEmpty
? HomePlaceHolder()
: Column(
children: [
const SizedBox(height: 10.0),
Column(
children: [
WorkoutTodosButton(),
const SizedBox(height: 20),
Container(
padding: const EdgeInsets.only(left: 10.0),
alignment: Alignment.centerLeft,
child: Text(
"${snapshot.data.length} " +
"TODO(s) Of Today" +
":",
style: Theme.of(context)
.textTheme
.headline4
.copyWith(fontSize: 16),
),
),
],
),
Expanded(
child: GridView.count(
padding: const EdgeInsets.fromLTRB(10, 20, 10, 10),
crossAxisSpacing: 24,
mainAxisSpacing: 24,
childAspectRatio: 0.6,
crossAxisCount: 3,
children: snapshot.data
.map((todo) => TodoCard(
todoData: todo)) //TodoCard(todoData: todo)
.toList(),
),
),
],
);
} else if (snapshot.hasError) {
print("something went wrong!");
}
return LoadingSpinner();
},
),
),
);
}
}
这是TodoCard类的代码
class TodoCard extends StatefulWidget {
final TodoData todoData;
TodoCard({this.todoData});
@override
_TodoCardState createState() => _TodoCardState();
}
class _TodoCardState extends State<TodoCard> {
// int currentIndex;
ShowDetails detailsProvider;
TodoActionSelection todoSelectedForChangeProvider;
SelectedTodosProvider selectedTodosProvider;
Color _borderColor = whiteColor;
@override
void initState() {
super.initState();
detailsProvider = Provider.of<ShowDetails>(context);
todoSelectedForChangeProvider = Provider.of<TodoActionSelection>(context);
selectedTodosProvider =
Provider.of<SelectedTodosProvider>(context, listen: false);
}
@override
Widget build(BuildContext context) {
return IgnorePointer(
ignoring: todoSelectedForChangeProvider.isTodoSelected ? true : false,
child: GestureDetector(
onLongPress: () {
selectedTodosProvider
..incrementTodosCount()
..addToSelectedTodosIDs(this.widget.todoData.id);
},
child: Container(
height: 100,
width: 80,
decoration: BoxDecoration(
border: Border.all(color: _borderColor),
boxShadow: [
BoxShadow(
color: Colors.black54,
blurRadius: 15.0,
offset: Offset(0.0, 0.75)),
],
),
child: Stack(
fit: StackFit.expand,
children: [
Image.asset(
"assets/images/${this.widget.todoData.targetedArea}.jpg",
fit: BoxFit.fill,
),
Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.bottomCenter,
end: Alignment.topCenter,
colors: [Theme.of(context).primaryColor, transparentColor],
stops: [0.2, 1],
),
),
),
Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Align(
alignment: Alignment.topRight,
child: Padding(
padding: const EdgeInsets.all(2.0),
child: DoneCheckBox(
onChecked: () {}, //this.widget.onCompleted,
todoId: this.widget.todoData.id),
),
),
Flexible(
child: Text(
this.widget.todoData.title,
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 25,
color: silverColor,
),
textAlign: TextAlign.center,
overflow: TextOverflow.ellipsis,
),
),
Column(
children: [
Container(
height: 40,
width: double.infinity,
decoration: BoxDecoration(
color: Theme.of(context).accentColor,
border: Border.symmetric(
horizontal: BorderSide(
color: todoSelectedForChangeProvider
.isTodoSelected
? greenColor
: whiteColor)),
),
child: Material(
color: transparentColor,
child: InkWell(
onTap: () {
detailsProvider.setShowDetails = false;
showDialog(
context: context,
builder: (context) =>
InfoPopup(todoData: this.widget.todoData),
);
},
child: Center(
child: Icon(
Icons.remove_red_eye,
size: 30,
),
),
),
),
),
SizedBox(height: 10.0),
Container(
margin: const EdgeInsets.only(bottom: 5.0),
child: Text(
this.widget.todoData.targetedArea.toUpperCase(),
style: Theme.of(context).textTheme.headline3.copyWith(
color: whiteColor,
shadows: [
BoxShadow(
color: blackColor,
offset: Offset(0, 3),
spreadRadius: 5,
),
],
),
),
),
],
),
],
),
todoSelectedForChangeProvider.isTodoSelected
? Container(
color: _borderColor, //Colors.green.withOpacity(0.3),
width: double.infinity,
height: double.infinity,
)
: SizedBox.shrink(),
],
),
),
),
);
}
}
如果可以，请帮忙，这个错误让我几天都忽略了开发这个应用程序