问题描述
我有以下Flutter BottomNavigationBar,我有3个子页面小部件。用户撰写评论并按下“提交”按钮后,我便调用void _clear()来重置文本字段小部件中的值。此方法在内部,可以从WriteReview小部件中调用,但不起作用,屏幕不刷新。它自己的数据正在重置,但UI尚未刷新。我尝试了有无setState(){_clear()};但没有结果。
TabBarView也有类似的问题。因此,我希望可以刷新所选的小部件页面。
我认为在缺失的TabBarView和BottomNavigationBar中处理小部件的方式有所不同。
import 'package:Flutter/cupertino.dart';
import 'package:Flutter/material.dart';
class HomeView extends StatefulWidget {
@override
_HomeViewState createState() => _HomeViewState();
}
class _HomeViewState extends State<HomeView> {
final String _writeReviewLabel = 'Write review';
final String _searchLabel = 'Search';
final String _accountLabel = 'Account';
var _currentIndex = 0;
final List<Widget> _bottomBarItems = [
WriteReviewView(),SearchView(),UserAccountView()
];
@override
Widget build(BuildContext context) {
final accentColor = Theme.of(context).accentColor;
final primaryColor = Theme.of(context).primaryColor;
return BaseView<HomePresenter>(
createPresenter: () => HomePresenter(),onInitialize: (presenter) {
_currentIndex = ModalRoute.of(context).settings.arguments;
},builder: (context,child,presenter) => Scaffold(
bottomNavigationBar: BottomNavigationBar(
backgroundColor: primaryColor,selectedItemColor: accentColor,unselectedItemColor: Colors.white,elevation: 0,currentIndex: _currentIndex,onTap: (index) {
onTabTapped(index,presenter);
},items: [
BottomNavigationBarItem(
activeIcon: Icon(Icons.rate_review),icon: Icon(Icons.rate_review),title: Text(_writeReviewLabel),),BottomNavigationBarItem(
activeIcon: Icon(Icons.search),icon: Icon(Icons.search),title: Text(_searchLabel),BottomNavigationBarItem(
activeIcon: Icon(Icons.person),icon: Icon(Icons.person),title: Text(_accountLabel)),],body: _bottomBarItems[_currentIndex]),);
}
void onTabTapped(int index,HomePresenter presenter) {
if (index == _currentIndex) {
return;
}
if (presenter.isAuthenticated) {
setState(() {
_currentIndex = index;
});
} else {
presenter.pushNamed(context,Routes.login,arguments: () {
if (presenter.isAuthenticated) {
Future.delayed(const Duration(microseconds: 500),() {
setState(() {
_currentIndex = index;
});
});
}
});
}
}
}
写评论视图
import 'package:Flutter/cupertino.dart';
import 'package:Flutter/material.dart';
import 'base/BaseView.dart';
class WriteReviewView extends StatefulWidget {
@override
_WriteReviewViewState createState() => _WriteReviewViewState();
}
class _WriteReviewViewState extends State<WriteReviewView> {
final String _locationLabel = 'Location';
final String _reviewLabel = 'Review';
@override
Widget build(BuildContext context) {
return BaseView<WriteReviewPresenter>(
createPresenter: () => WriteReviewPresenter(),onInitialize: (presenter) {
presenter.init();
},presenter) => Container(
color: Theme.of(context).backgroundColor,child: _body(presenter),));
}
Widget _body(WriteReviewPresenter presenter) {
final height = MediaQuery.of(context).size.height;
return LayoutBuilder(builder: (context,constraint) {
return SingleChildScrollView(
child: ConstrainedBox(
constraints: BoxConstraints(minHeight: constraint.maxHeight),child: IntrinsicHeight(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,children: [
Card(
margin: EdgeInsets.fromLTRB(4.0,4.0,8.0),child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 8.0),child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,children: <Widget>[
Padding(
padding: EdgeInsets.only(top: 10,bottom: 20),child: Row(
children: [
Icon(Icons.location_on,color: Theme.of(context).cursorColor),SectionTitle(_locationLabel),ChooseAddressButton(presenter.addressContainer.address,() {
presenter.navigateNewAddress(context);
}),SizedBoxes.medium,Card(
margin: EdgeInsets.fromLTRB(4.0,child: Column(
children: [
Padding(
padding: EdgeInsets.only(top: 10),child: Row(
children: [
Icon(Icons.star,color: Theme.of(context).indicatorColor),SectionTitle(_reviewLabel),CustomTextFormField(
data: presenter.reviewContainer.review,showMinimum: true,characterLimit: 50,maxLines: 4,height: 100),ModifyratingBar(50.0,presenter.reviewContainer.rating,false),Padding(
padding: EdgeInsets.symmetric(vertical: 5),child: Divider(indent: 40,endindent: 40)),Padding(
padding: EdgeInsets.symmetric(horizontal: 10),child: Card(
color: Theme.of(context).accentColor,child: FlatButton(
onpressed: () {
_submit(context,presenter);
},child: Text('Submit',style:TextStyle(fontWeight: FontWeight.bold,fontSize: 18,color: Colors.white)),);
});
}
void _submit(BuildContext context,WriteReviewPresenter presenter) async {
LoadingPopup.show(context);
final status = await presenter.submit(context);
LoadingPopup.hide(context);
if (status == ReviewStatus.successful) {
PostCompletePopup.show(context);
setState(() {
presenter.clear();
});
} else {
presenter.showError(context,status);
}
}
}
解决方法
setState()
仅刷新调用它的小部件及其下的所有小部件。
从setState()
小部件调用WriteReview
时,它将不会更新HomeView
小部件。尝试使用某种回调将setState()
调用移至HomeView
小部件。