我正在构建一个颤振应用程序，其中有一个同步融合日历，您可以向其中添加事件。但是，当我尝试添加事件时，它不会被添加，因此尽管在添加事件后弹出“添加事件”页面，但它不会显示在日历上。
访问添加事件的类“InsertEvent”的代码：
class EditEventsPage extends StatefulWidget {
final Events? event;
const EditEventsPage({Key? key, this.event}) : super(key: key);
@override
_EditEventsPageState createState() => _EditEventsPageState();
}
class _EditEventsPageState extends State<EditEventsPage> {
var insertEventInstance = InsertEvent();
final _formKey = GlobalKey<FormState>();
final titleController = TextEditingController();
late DateTime fromDate;
late DateTime toDate;
@override
void initState() {
super.initState();
if (widget.event == null) {
fromDate = DateTime.now();
toDate = DateTime.now().add(Duration(hours: 4));
}
}
@override
void dispose() {
titleController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Color(0xFF1c3f77),
elevation: 0,
leading: CloseButton(),
actions: buildEditingActions(),
),
body: SingleChildScrollView(
padding: EdgeInsets.all(12),
child: Form(
key: _formKey,
child: Column(mainAxisSize: MainAxisSize.min, children: <Widget>[
buildTitle(),
SizedBox(height: 25),
buildDateTime(),
])),
),
);
}
List<Widget> buildEditingActions() => [
ElevatedButton.icon(
style: ElevatedButton.styleFrom(
primary: Colors.transparent, shadowColor: Colors.transparent),
icon: Icon(Icons.done),
label: Text(
'Add',
style: TextStyle(color: Colors.white, fontSize: 15),
),
onPressed: saveEvent,
)
];
Widget buildTitle() => TextFormField(
style: TextStyle(fontSize: 15),
decoration:
InputDecoration(border: UnderlineInputBorder(), hintText: 'Title'),
onFieldSubmitted: (_) => saveEvent,
validator: (title) =>
title != null && title.isEmpty ? 'Title cannot be empty' : null,
controller: titleController,
);
保存事件函数：
Future saveEvent() async {
final isValid = _formKey.currentState!.validate();
if (isValid) {
final event = Events(
title: titleController.text,
details: 'testing 1 2 3',
from: fromDate,
to: toDate,
isAllday: false,
);
insertEventInstance.addEvent(event);
Navigator.of(context).pop();
}
}
插入事件类：
class InsertEvent {
final List<Events> _events = [];
List<Events> get events => _events;
void addEvent(Events event) {
_events.add(event);
}
}
我使用“var insertEventInstance = InsertEvent();” 访问课程并尝试添加事件。虽然 saveEvent 函数在我单击添加后弹出（如代码中所写），但事件及其详细信息根本不会出现。
日历数据源：
class CalendarWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
var eventInstance = InsertEvent();
final events = eventInstance.events;
return SfCalendar(
dataSource: EventDataSource(events),
);
}
在日历的数据源中调用事件时是否有错误？如何显示添加的事件？