我正在使用 flutter_form_builder 创建我的表单。用户将使用表单创建自己的投票，并且他/她将根据需要向他/她的问题添加选项。我解决了选择部分的动态添加，但现在的问题是；当我用一个选项创建一个问题并点击提交按钮时，选择、问题和日期会打印在控制台中，但是如果我点击 fab 按钮来创建另一个选择，只有新创建的字段会打印它的内容日期和问题，旧字段被忽略。
如何获得动态创建的每个字段的结果..
提前致谢..
这是我的代码：-
import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:intl/intl.dart';
class AddPoll extends StatefulWidget {
@override
_AddPollState createState() => _AddPollState();
}
class _AddPollState extends State<AddPoll> {
final GlobalKey<FormBuilderState> _fbKey = GlobalKey<FormBuilderState>();
List<Widget> choiceFieldList;
void initState() {
super.initState();
choiceFieldList = <Widget>[];
}
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
appBar: AppBar(title: Text("Create a poll")),
floatingActionButtonLocation: FloatingActionButtonLocation.endFloat,
floatingActionButton: FloatingActionButton(
child: Icon(Icons.add),
onPressed: () {
setState(() {
choiceFieldList.add(ChoiceField());
});
}
),
body: Padding(
padding: EdgeInsets.all(10.0),
child: SingleChildScrollView(
child: Column(
children: [
FormBuilder(
key: _fbKey,
initialValue: {
'date': DateTime.now()
},
autovalidateMode: AutovalidateMode.always,
child: Column(
children: <Widget>[
FormBuilderTextField(
attribute: 'question',
validators: [FormBuilderValidators.required()],
maxLines: null,
keyboardType: TextInputType.multiline,
decoration: InputDecoration(
labelText: "Your Question",
border: OutlineInputBorder()
)
),
Container(
padding: EdgeInsets.fromLTRB(0, 30, 0, 20),
alignment: Alignment.centerLeft,
child: Text(
"Choices:-",
style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.bold
)
)
),
ListView.builder(
shrinkWrap: true,
itemCount: choiceFieldList.length,
itemBuilder: (context, index) => choiceFieldList[index],
),
Visibility(
visible: false,
child: FormBuilderDateTimePicker(
attribute: "date",
inputType: InputType.both,
validators: [FormBuilderValidators.required()],
format: DateFormat("dd-MM-yyyy 'at' h:mma"),
decoration: InputDecoration(labelText: "Date of Poll")
)
)
]
)
),
SizedBox(height: 30.0),
ButtonBar(
alignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
RaisedButton(
child: Text("Reset"),
onPressed: () {
_fbKey.currentState.reset();
}
),
RaisedButton(
child: Text("Submit"),
onPressed: () async {
_fbKey.currentState.save();
print(_fbKey.currentState.value);
if (_fbKey.currentState.validate()) {
// Loading().show(context);
// var date = _fbKey.currentState.value['date'];
// var resp = await registerUser(date);
}
}
)
]
)
]
)
)
)
)
);
}
}
class ChoiceField extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Center(
child: FormBuilderTextField(
attribute: 'choice',
validators: [FormBuilderValidators.required()],
decoration: InputDecoration(
labelText: "Enter Choice",
border: OutlineInputBorder()
)
)
);
}
}
