如何解决颤振更改选项卡中显示的内容
点击另一个选项卡时,是否可以通过任何方式更改文本或其他内容?
我尝试在开关内使用tabNames [index]和index,并且为每个页面创建了不同的大小写,但是它不起作用。我要在每个标签中显示多个小部件,具体取决于我点击哪个标签。
import 'package:Flutter/material.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Navigation Example',home: new MyHomePage(),);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
@override
_MyHomePageState createState() => new _MyHomePageState();
}
const List<String> tabNames = const<String>[
'foo','bar','baz','quox','quuz','corge','grault','garply','waldo'
];
class _MyHomePageState extends State<MyHomePage> {
int _screen = 0;
@override
Widget build(BuildContext context) {
return new DefaultTabController(
length: tabNames.length,child: new Scaffold(
appBar: new AppBar(
title: new Text('Navigation example'),),body: new TabBarView(
children: new List<Widget>.generate(tabNames.length,(int index) {
switch (_screen) {
case 0: return new Center(
child: new Text('First screen,${tabNames[index]}'),);
case 1: return new Center(
child: new Text('Second screen'),);
}
}),bottomNavigationBar: new Column(
mainAxisSize: MainAxisSize.min,crossAxisAlignment: CrossAxisAlignment.stretch,children: [
new AnimatedCrossFade(
firstChild: new Material(
color: Theme
.of(context)
.primaryColor,child: new TabBar(
isScrollable: true,tabs: new List.generate(tabNames.length,(index) {
return new Tab(text: tabNames[index].toupperCase());
}),secondChild: new Container(),crossFadeState: _screen == 0
? CrossFadeState.showFirst
: CrossFadeState.showSecond,duration: const Duration(milliseconds: 300),new BottomNavigationBar(
currentIndex: _screen,onTap: (int index) {
setState(() {
_screen = index;
});
},items: [
new BottomNavigationBarItem(
icon: new Icon(Icons.airplanemode_active),title: new Text('Airplane'),new BottomNavigationBarItem(
icon: new Icon(Icons.motorcycle),title: new Text('Motorcycle'),],);
}
}
解决方法
我认为您不适合将小部件列表传递给TabBarView的方式。不要使用List.generate:而是尝试像这样包装小部件:
pd.read_html()
选项卡控制器可动态处理页面更改,而无需放置开关盒来选择屏幕。
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