如何在Navigator.Pop或Push in flutter中刷新状态
在这里，我有两页，第一页称为BSP_signup_terms页，第二页为Bsp_Service_page。当我在该页面上的BSP_signup_terms上时，我必须根据选中的复选框选择一些复选框，它将显示一些数据。但是问题是它将显示完整的数据，但是当我从BSP_signup_terms返回到Bsp_signup_page时，我正在更改复选框，然后再次按下下一步按钮时，它不会更改结果与之前的结果相同。
这是输出页的图像
在此图像中，当我仅选择一个复选框时，我已经附加了两个屏幕输出，它将在服务页面中呈现一些值，当我回到“条款和条件”页面并再次选择一个复选框时，它将不更新服务页面
这是我尝试过的代码。
BSP_Signup_Terms_Page
class BspLicensedSignupTermsPage extends StatefulWidget {
static const String routeName = "/bspLicensedSignupTerms";
final BspSignupCommonModel bspSignupCommonModel;
BspLicensedSignupTermsPage({
Key key,
@required this.bspSignupCommonModel,
}) : super(key: key);
@override
_BspLicensedSignupTermsPageState createState() =>
_BspLicensedSignupTermsPageState();
}
class _BspLicensedSignupTermsPageState
extends State<BspLicensedSignupTermsPage> {
@override
void initState() {
super.initState();
}
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
bool _isWalkIn = false;
bool _isHome = false;
bool _isOnDemand = false;
Widget _buildselectcheckbox() {
return Text(
AppConstantsValue.appConst['bsplicensedsignupterms']['selectcheck']
['translation'],
);
}
// Walkin
_onCustomerWalkin(value) {
setState(() {
_isWalkIn = value;
});
}
Widget _buildCustomerWalkIn() {
return TudoConditionWidget(
text: AppConstantsValue.appConst['bsplicensedsignupterms']
['CustomerWalkIn']['translation'],
onChanged: (value) {
print(value);
_onCustomerWalkin(value);
},
validate: false,
);
}
// Home
_onCustomerInHome(value) {
setState(() {
_isHome = value;
});
}
Widget _buildCustomerInHome() {
return TudoConditionWidget(
text: AppConstantsValue.appConst['bsplicensedsignupterms']
['CustomerInHome']['translation'],
onChanged: (value) {
_onCustomerInHome(value);
},
validate: false,
);
}
Widget _buildCustomerInHomeHelp() {
return Text(
AppConstantsValue.appConst['bsplicensedsignupterms']['businesscheckhelp']
['translation'],
);
}
// On Demand
_onCustomerOnDemand(value) {
setState(() {
_isOnDemand = value;
});
}
Widget _buildBusinessOnDemand() {
return TudoConditionWidget(
text: AppConstantsValue.appConst['bsplicensedsignupterms']
['BusinessOnDemand']['translation'],
onChanged: (value) {
_onCustomerOnDemand(value);
},
validate: false,
);
}
Widget _buildBusinessOnDemandHelp() {
return Text(AppConstantsValue.appConst['bsplicensedsignupterms']
['businessprovidehelp']['translation']);
}
@override
Widget build(BuildContext context) {
final appBar = AppBar(
title: Text("Bsp Licensed Signup Terms and Condition"),
leading: IconButton(
icon: Icon(Icons.arrow_back_ios),
onPressed: () {
NavigationHelper.navigatetoBack(context);
},
),
centerTitle: true,
);
final bottomNavigationBar = Container(
height: 56,
//margin: EdgeInsets.symmetric(vertical: 24, horizontal: 12),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new FlatButton.icon(
icon: Icon(Icons.close),
label: Text('Clear'),
color: Colors.redAccent,
textColor: Colors.black,
padding: EdgeInsets.symmetric(vertical: 10, horizontal: 30),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7),
),
onPressed: () {
_formKey.currentState.reset();
},
),
new FlatButton.icon(
icon: Icon(FontAwesomeIcons.arrowCircleRight),
label: Text('Next'),
color: colorStyles["primary"],
textColor: Colors.white,
padding: EdgeInsets.symmetric(vertical: 10, horizontal: 30),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7),
),
onPressed: () {
if (_formKey.currentState.validate()) {
if (_isHome == false &&
_isOnDemand == false &&
_isWalkIn == false) {
showDialog(
barrierDismissible: false,
context: context,
builder: (context) => ShowErrorDialog(
title: Text('Select Service'),
content: Text(
'Please select atleast one service type to proceed next',
),
));
} else {
BspSignupCommonModel model = widget.bspSignupCommonModel;
model.isWalkin = _isWalkIn;
model.isHome = _isHome;
model.isOnDemand = _isOnDemand;
print(model.toJson());
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
BspServicePage(bspSignupCommonModel: model),
),
);
}
}
},
),
],
),
);
return new Scaffold(
appBar: appBar,
bottomNavigationBar: bottomNavigationBar,
body: Container(
height: double.infinity,
width: double.infinity,
child: Stack(
children: <Widget>[
SingleChildScrollView(
child: SafeArea(
child: Form(
autovalidate: true,
key: _formKey,
child: Scrollbar(
child: SingleChildScrollView(
dragStartBehavior: DragStartBehavior.down,
padding: const EdgeInsets.symmetric(horizontal: 10.0),
child: new Container(
decoration: BoxDecoration(
borderRadius: new BorderRadius.circular(25)),
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
_buildselectcheckbox(),
_buildCustomerWalkIn(),
_buildCustomerInHome(),
_buildCustomerInHomeHelp(),
_buildBusinessOnDemand(),
_buildBusinessOnDemandHelp(),
],
),
),
),
),
),
),
),
],
),
),
);
}
}
BSP_Service_Page
class BspServicePage extends StatefulWidget {
static const String routeName = "/bspService";
final BspSignupCommonModel bspSignupCommonModel;
BspServicePage({
Key key,
@required this.bspSignupCommonModel,
}) : super(key: key);
@override
_BspServicePageState createState() => _BspServicePageState();
}
class _BspServicePageState extends State<BspServicePage> {
List<int> servicesIds = [];
Map<String, bool> selection = {};
List<BspServices.Service> selectedServices = [];
SearchBarController _controller = new SearchBarController();
String _searchText = '';
bool refreshservices = true;
@override
void initState() {
super.initState();
}
void _showErrorDialog(String message) {
showDialog(
barrierDismissible: false,
context: context,
builder: (context) => ShowErrorDialog(
title: Text('An Error Occurred!'),
content: Text(message),
),
);
}
void refresh() {
setState(() {
refreshservices = !refreshservices;
});
}
@override
Widget build(BuildContext context) {
var _bspServiceBloc = new BspServiceBloc();
final appBar = SearchBar(
controller: _controller,
onQueryChanged: (String query) {
print('Search Query $query');
setState(() {
_searchText = query;
});
},
defaultBar: AppBar(
centerTitle: true,
leading: IconButton(
icon: Icon(Icons.arrow_back_ios),
onPressed: () {
refresh();
NavigationHelper.navigatetoBack(context);
}),
title: Text('Select Services'),
),
);
final bottomNavigationBar = Container(
height: 56,
// margin: EdgeInsets.symmetric(vertical: 24, horizontal: 12),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new FlatButton.icon(
icon: Icon(Icons.close),
label: Text('Clear'),
color: Colors.redAccent,
textColor: Colors.black,
padding: EdgeInsets.symmetric(vertical: 10, horizontal: 30),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7),
),
onPressed: () {
print('reseting the state');
setState(() {
selection = {};
servicesIds = [];
});
},
),
new FlatButton.icon(
icon: Icon(FontAwesomeIcons.arrowCircleRight),
label: Text('Next'),
color: colorStyles["primary"],
textColor: Colors.white,
padding: EdgeInsets.symmetric(vertical: 10, horizontal: 30),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7),
),
onPressed: () {
BspSignupCommonModel model = widget.bspSignupCommonModel;
model.servicesIds = servicesIds;
model.services = selectedServices;
print('servicesIds at the next button');
print(servicesIds);
print(model.toJson());
if (servicesIds.length == 0) {
_showErrorDialog(
'You need to select at least one service to proceed next!');
} else {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => BusinessProfilePage(
bspSignupCommonModel: model,
),
),
);
}
},
),
],
),
);
return new Scaffold(
appBar: appBar,
bottomNavigationBar: bottomNavigationBar,
body: new BspServiceScreen(
bspServiceBloc: _bspServiceBloc,
bspSignupCommonModel: widget.bspSignupCommonModel,
servicesIds: servicesIds,
selection: selection,
searchQuery: _searchText,
selectedServices: selectedServices,
refresh: refresh,
),
);
}
}
Bsp_service_screen
class BspServiceScreen extends StatefulWidget {
final BspServiceBloc _bspServiceBloc;
final String searchQuery;
final List<int> servicesIds;
final Map<String, bool> selection;
final BspSignupCommonModel bspSignupCommonModel;
final List<BspServices.Service> selectedServices;
final Function refresh;
const BspServiceScreen({
Key key,
@required BspServiceBloc bspServiceBloc,
@required this.bspSignupCommonModel,
@required this.servicesIds,
@required this.selection,
@required this.selectedServices,
@required this.refresh,
this.searchQuery,
}) : _bspServiceBloc = bspServiceBloc,
super(key: key);
@override
BspServiceScreenState createState() {
return new BspServiceScreenState(_bspServiceBloc);
}
}
class BspServiceScreenState extends State<BspServiceScreen> {
final BspServiceBloc _bspServiceBloc;
BspServiceScreenState(this._bspServiceBloc);
// Map<String, bool> _selection = {};
@override
void initState() {
super.initState();
bool isHome = widget.bspSignupCommonModel.isHome;
bool isWalkIn = widget.bspSignupCommonModel.isWalkin;
bool isOnDemand = widget.bspSignupCommonModel.isOnDemand;
this._bspServiceBloc.dispatch(LoadBspServiceEvent(
countryId: 1,
isHome: isHome,
isOnDemand: isOnDemand,
isWalkin: isWalkIn,
));
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return BlocBuilder<BspServiceBloc, BspServiceState>(
bloc: widget._bspServiceBloc,
builder: (
BuildContext context,
BspServiceState currentState,
) {
if (currentState is UnBspServiceState) {
return Center(child: CircularProgressIndicator());
}
if (currentState is ErrorBspServiceState) {
return new Container(
child: new Center(
child: new Text(currentState.errorMessage ?? 'Error'),
),
);
}
if (currentState is InBspServiceState) {
// print(
// 'in bsp service state, ${currentState.bspServices.servicesByCountry.length}');
if (currentState.bspServices.servicesByCountry.length == 0) {
return Container(
child: Center(
child: Text("No Services available for this combination"),
),
);
} else {
return new Container(
child:
_renderServices(currentState.bspServices.servicesByCountry),
);
}
}
return Container();
},
);
}
List<ServicesByCountry> finalList = new List();
ListView _renderServices(List<ServicesByCountry> lovCountryServices) {
WidgetsBinding.instance.addPostFrameCallback((_) {
if (widget.searchQuery != '') {
finalList.clear();
lovCountryServices.forEach((ServicesByCountry data) {
if (data.name
.toLowerCase()
.contains(widget.searchQuery.toLowerCase())) {
setState(() {
finalList.add(data);
});
} else {
data.services.forEach((ServiceList.Service services) {
if (services.name
.toLowerCase()
.contains(widget.searchQuery.toLowerCase())) {
setState(() {
finalList.add(data);
});
}
});
}
});
} else {
setState(() {
finalList.clear();
finalList.addAll(lovCountryServices);
});
}
});
return ListView.builder(
shrinkWrap: true,
padding: const EdgeInsets.all(8.0),
itemCount: finalList.length,
itemBuilder: (BuildContext context, int index) {
ServicesByCountry item = finalList[index];
List itemsList = item.services;
return ExpansionTile(
title: Text(item.name),
children: List.generate(itemsList.length, (i) {
widget.selection[itemsList[i].name] =
widget.selection[itemsList[i].name] ?? itemsList[i].isSelected;
return CheckboxListTile(
title: Text(itemsList[i].name),
value: widget.selection[itemsList[i].name],
onChanged: (val) {
setState(() {
widget.selection[itemsList[i].name] = val;
if (val) {
widget.servicesIds.add(itemsList[i].id);
List<BspServices.Service> services =
widget.selectedServices.where((service) {
return service.mainCategory == item.name;
}).toList();
SubCategory subService = new SubCategory(
id: itemsList[i].id,
name: itemsList[i].name,
);
List<SubCategory> subCategories = [];
if (services.length == 0) {
subCategories.add(subService);
widget.selectedServices.add(
new BspServices.Service(
mainCategory: item.name,
mainCategoryId: item.id,
subCategory: subCategories,
),
);
} else {
print('services in else');
print(services[0].subCategory);
subCategories = services[0].subCategory;
subCategories.add(subService);
}
} else {
widget.servicesIds.removeWhere((service) {
return service == itemsList[i].id;
});
List<BspServices.Service> services =
widget.selectedServices.where((service) {
return service.mainCategory == item.name;
}).toList();
services[0].subCategory.removeWhere((subService) {
return subService.id == itemsList[i].id;
});
}
});
print('widget.servicesIds after set state');
print(widget.servicesIds);
},
);
}),
);
},
);
}
}
2 个答案:
答案 0 :(得分：2)
返回首页后可以使用setState（）：
class Enrole {
private String name;
private String email;
private long contactno;
private String address;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public long getContactno() {
return contactno;
}
public void setContactno(long contactno) {
this.contactno = contactno;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
答案 1 :(得分：0)
请尝试以下代码：-
首先，您添加一个方法异步方法：-
void redirectToNextScreen() async {
final Route route = MaterialPageRoute(
builder: (context) => BspServicePage(bspSignupCommonModel: model));
final result = await Navigator.push(mContext, route);
try {
if (result != null) {
if (result) {
//Return callback here.
}
}
} catch (e) {
print(e.toString());
}
}
然后下一步，您可以在下一步按钮按下的事件的“ BSP_Signup_Terms_Page ”中调用此方法。
第二，您可以在“ BspServicePage ”屏幕的下一步和取消事件中添加以下行。
Navigator.pop(mContext, true); //true means refresh back page and false means not refresh.
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