我试图通过以下方式创建嵌套的选项卡栏视图，方法是从外部选项卡视图返回包含另一个选项卡视图的列，但是它仅显示空白屏幕而不是第二个选项卡视图。我怎样才能解决这个问题？
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: DefaultTabController(length: 2, child: MyHomePage(title: '')),
);
}
}
class MyHomePage extends StatelessWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
Widget build(BuildContext context){
final view = LayoutBuilder(builder: (context, constraints){
//created a widget here with content
});
return Scaffold(
appBar: AppBar(
title: Text('Tab bar view'), bottom: TabBar(
tabs: [
Tab(icon: Icon(Icons.directions_car)),
Tab(icon: Icon(Icons.directions_transit)),
]),
),
body: TabBarView(children: [DefaultTabController(length: 2, child: Column(
children: <Widget>[TabBar(tabs: [Tab(text: 'Home'),Tab(text: 'News')
, Container(child: TabBarView(
children: <Widget>[ view, Icon(Icons.access_alarms)],
))])]
) ), Icon(Icons.directions_car)]));
}
}
import 'package:flutter/material.dart';
class Locationstat extends StatefulWidget {
@override
_LocationstatState createState() => _LocationstatState();
}
class _LocationstatState extends State<Locationstat>
with SingleTickerProviderStateMixin {
TabController _tabController;
@override
void initState() {
super.initState();
_tabController = new TabController(length: 2, vsync: this);
}
@override
void dispose() {
super.dispose();
_tabController.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.white,
elevation: 0,
title: Text('Statistics'),
bottom: TabBar(
controller: _tabController,
indicatorColor: Colors.orange,
labelColor: Colors.orange,
unselectedLabelColor: Colors.black54,
tabs: <Widget>[
Tab(
text:('Pokhara Lekhnath'),
),
Tab(
text:('Outside Pokhara-Lekhnath'),
),
]),
),
body: TabBarView(
children: <Widget>[
NestedTabBar(),
NestedTabBar(),
],
controller: _tabController,
),
);
}
}
class NestedTabBar extends StatefulWidget {
@override
_NestedTabBarState createState() => _NestedTabBarState();
}
class _NestedTabBarState extends State<NestedTabBar>
with TickerProviderStateMixin {
TabController _nestedTabController;
@override
void initState() {
super.initState();
_nestedTabController = new TabController(length: 2, vsync: this);
}
@override
void dispose() {
super.dispose();
_nestedTabController.dispose();
}
@override
Widget build(BuildContext context) {
double screenHeight = MediaQuery.of(context).size.height;
return Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
TabBar(
controller: _nestedTabController,
indicatorColor: Colors.orange,
labelColor: Colors.orange,
unselectedLabelColor: Colors.black54,
isScrollable: true,
tabs: <Widget>[
Tab(
text: "Inside Pokhara",
),
Tab(
text: "Outside Pokhara",
),
],
),
Container(
height: screenHeight * 0.70,
margin: EdgeInsets.only(left: 16.0, right: 16.0),
child: TabBarView(
controller: _nestedTabController,
children: <Widget>[
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
color: Colors.blueGrey[300],
),
),
Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0),
color: Colors.blueGrey[300],
),
),
],
),
)
],
);
}
}
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