【发布时间】：2021-06-15 16:47:41
【问题描述】：
我创建了一个可重用字段，调用该字段以在我的应用程序的不同屏幕中显示表单中的不同字段它崩溃了。
class EntryField extends StatefulWidget {
@override
_EntryFieldState createState() => _EntryFieldState();
final String title;
final TextEditingController controller;
final TextInputType inputType;
final FilteringTextInputFormatter filter;
final hintText;
EntryField({@required this.title,this.hintText,@required this.controller,@required this.inputType,@required this.filter});
}
class _EntryFieldState extends State<EntryField> {
@override
void dispose() {
widget.controller.dispose();
print("anything");
super.dispose();
}
@override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.symmetric(vertical: 10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
this.widget.title,
style: GoogleFonts.quicksand(
fontSize: 18,
)
),
SizedBox(
height: 10,
),
TextFormField(
controller: this.widget.controller,
keyboardType: this.widget.inputType,
inputFormatters: <TextInputFormatter>[
this.widget.filter,
],
validator: (value){
if(value.isEmpty){
return "${this.widget.title} is a Required Field";
}
return null;
},
decoration: InputDecoration(
hintText: this.widget.hintText,
border: InputBorder.none,
fillColor: Color(0xfff3f3f4),
filled: true,
errorBorder: new OutlineInputBorder(
borderSide: new BorderSide(color: Colors.red),
),
errorStyle: TextStyle(
fontSize: 15,
),
),
),
],
),
);
}
}
在这个类中，我将字段值传递给它
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
final _serviceTitleController = TextEditingController();
final _serviceCategoryController = TextEditingController();
final _servicePriceController = TextEditingController();
ToastErrorMessage _error = ToastErrorMessage();
ToastValidMessage _valid = ToastValidMessage();
class AddServices extends StatefulWidget {
@override
_AddServicesState createState() => _AddServicesState();
}
class _AddServicesState extends State<AddServices> {
int currentIndex;
String _cityName;
final WorkshopServiceQueries _add = WorkshopServiceQueries();
final _firebaseUser = FirebaseAuth.instance.currentUser;
@override
void initState() {
cityName();
super.initState();
currentIndex = 0;
}
@override
void dispose() {
print("hello");
super.dispose();
}
void clearControllerText(){
_serviceTitleController.clear();
_serviceCategoryController.clear();
_servicePriceController.clear();
}
Future cityName() async{
_cityName = await _add.getWorkshopCityName();
}
changePage(int index) {
setState(() {
currentIndex = index;
});
}
validateFields() async{
final ValidateWorkshopServices service = ValidateWorkshopServices();
final int _price = int.tryParse(_servicePriceController.text.trim());
if(!service.validateServiceCategory(_serviceCategoryController.text.trim()) && !service.validateServiceTitle(_serviceTitleController.text.trim()) && !service.validateServicePrice(_price)){
_error.errorToastMessage(errorMessage: "Enter Valid Data in Each Field");
}
else if(!service.validateServiceCategory(_serviceCategoryController.text.trim())){
_error.errorToastMessage(errorMessage: "Service Category Must Only contain Alphabets");
}
else if(!service.validateServiceTitle(_serviceTitleController.text.trim())){
_error.errorToastMessage(errorMessage: "Service Title Must Only contain Alphabets");
}
else if(!service.validateServicePrice(_price)){
_error.errorToastMessage(errorMessage: "Service Price must be less than or equal to 2000");
}
else{
await addService(_price);
}
}
Future<void> addService(int price) async{
try {
Services data = Services(title: _serviceTitleController.text.trim(), category: _serviceCategoryController.text.trim(), price: price, workshopCity: _cityName, workshopId: _firebaseUser.uid);
await _add.addWorkshopService(data);
if(WorkshopServiceQueries.resultMessage == WorkshopServiceQueries.completionMessage){
_valid.validToastMessage(validMessage: WorkshopServiceQueries.resultMessage);
clearControllerText();
Future.delayed(
new Duration(seconds: 2),
(){
Navigator.pop(context);
},
);
}
else{
_error.errorToastMessage(errorMessage: WorkshopServiceQueries.resultMessage);
}
}catch(e){
_error.errorToastMessage(errorMessage: e.toString());
}
}
@override
Widget build(BuildContext context) {
final height = MediaQuery.of(context).size.height;
int _checkboxValue;
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text(
'BIKERSWORLD',
style: GoogleFonts.quicksand(
color: Colors.white,
fontSize: 18,
),
),
backgroundColor: Color(0XFF012A4A),
leading: IconButton(icon:Icon(Icons.arrow_back, color: Colors.orange,),
onPressed:() => Navigator.pop(context),
)
),
body: Container(
height: height,
child: Stack(
children: <Widget>[
Container(
padding: EdgeInsets.symmetric(horizontal: 20),
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
SizedBox(height: 30,),
_title(),
SizedBox(height: 40),
_addServicesWidget(),
SizedBox(height: 20),
FlatButton(
child: Container(
padding: EdgeInsets.symmetric(vertical: 15),
alignment: Alignment.center,
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(5)),
boxShadow: <BoxShadow>[
BoxShadow(
color: Colors.grey.shade200,
offset: Offset(2, 4),
blurRadius: 5,
spreadRadius: 2)
],
gradient: LinearGradient(
begin: Alignment.centerLeft,
end: Alignment.centerRight,
colors: [Color(0xfffbb448), Color(0xfff7892b)])),
child: Text(
'Register Now',
style: GoogleFonts.krub(
fontSize: 18,
color: Colors.white,
),
),
),
onPressed: (){
if(!_formKey.currentState.validate()){
return;
}
else{
validateFields();
}
},
),
SizedBox(height: 20),
],
),
),
),
],
),
),
),
);
}
}
Widget _addServicesWidget() {
return Form(
key: _formKey,
autovalidateMode: AutovalidateMode.disabled,
child: Column(
children: <Widget>[
EntryField(title: "Category",hintText: 'Mechanical',controller: _serviceCategoryController,inputType: TextInputType.text,filter: FilteringTextInputFormatter.allow(RegExp("[a-zA-Z ]"))),
SizedBox(height:15,),
EntryField(title: "Title",hintText: 'wheel barring',controller: _serviceTitleController,inputType: TextInputType.text,filter: FilteringTextInputFormatter.allow(RegExp("[a-zA-Z ]"))),
SizedBox(height:15,),
EntryField(title: "Price",hintText: 'price < 2000',controller: _servicePriceController,inputType: TextInputType.number,filter:FilteringTextInputFormatter.digitsOnly),
],
),
);
}
【问题讨论】：
-
你为什么要在那个类而不是你最初创建它的类中处理控制器？
-
我将控制器放置在可重用的小部件中，我一次又一次调用哪个类来生成不同的字段。
-
我也尝试在我调用这个可重用类的类中进行处理，但仍然显示相同的错误
-
很抱歉，您必须给我们一个更小、可重现的代码，以便我们尝试重现您的问题并为您提供帮助。事实上，您有很多我们无法访问的东西。
-
我已经分享了我使用这些可重用字段的整个班级
标签： flutter android-studio dart texteditingcontroller