如何在Dart中的两个屏幕之间传递数据
如何在Dart中的两个屏幕之间传递数据
提问于 2022-06-16 23:29:42
我需要使用dart将数据发送到另一个屏幕，我尝试在另一个屏幕(editdata.dart)上创建构造函数，以便从主屏幕(readdata.dart)获取数据，这是有状态的小部件，问题在于：createState() => EditFire() EditFire类需要传递参数，但我还没有数据。
editdata.dart：
class EditData extends StatefulWidget {
@override
//Here the Error Occurs//
State<StatefulWidget> createState() => EditFire();
}
class EditFire extends State<EditData> {
EditFire(String ID, String date, String time, String dest, String src){
currentID = ID;
olddate = date;
oldtime = time;
_destinationcontroller.text = dest;
_sourcecontroller.text = src;
}
late String currentID;
final _destinationcontroller = TextEditingController();
final _sourcecontroller = TextEditingController();
late String olddate;
late String oldtime;
}在readdata.dart中：
EditFire("2","17/6/2022","2:25","NewYork","Japan");回答 2
Stack Overflow用户
回答已采纳
发布于 2022-06-17 03:33:21
第一页
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(builder: (_){
return EditData("2","17/6/2022","2:25","NewYork","Japan");
}));
},要接收数据的第二页
class EditData extends StatefulWidget {
String currentID;
String _destinationcontroller;
String _sourcecontroller;
String olddate;
String oldtime;
EditData(this.currentID, this._destinationcontroller, this._sourcecontroller,
this.olddate, this.oldtime, {Key? key}) : super(key: key);
@override
State<EditData> createState() => _EditDataState();
}
class _EditDataState extends State<EditData> {
@override
Widget build(BuildContext context) {
return Container(
child: Center(child:
Text('${widget.currentID}'),),
);
}
}Stack Overflow用户
发布于 2022-06-17 05:37:47
要将EditData的数据访问到EditFire，不需要将其传递到构造函数中。如您所见，EditFire是EditData的状态。
因此，如果您想在EditFire中获得用于EditData的任何内容，您可以像widget.abc那样使用它。
class EditData extends StatefulWidget {
// here, in constructor of widget, we are gathering values.
EditData(
{required this.currentID,
required this.olddate,
required this.oldtime,
Key? key})
: super(key: key);
String currentID;
String olddate;
String oldtime;
State<StatefulWidget> createState() => EditFire();
}
// this is a state widget of EditData. so no need to pass value in constructor of state widget.
class EditFire extends State<EditData> {
final _destinationcontroller = TextEditingController();
final _sourcecontroller = TextEditingController();
String? currentID;
String? olddate;
String? oldtime;
@override
void initState() {
super.initState();
// you can get the values like this
currentID = widget.currentID;
olddate = widget.olddate;
oldtime = widget.oldtime;
}
}要将值传递给EditData，需要将其传递给构造函数。喜欢,
EditData(currentID: "", olddate: "", oldtime: "");希望，这将解决你的问题，仍未解决，请与问题评论。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/72652882
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