在颤动中,实现标签布局既简单又直接。这是官方documentation的一个简单例子:
import 'package:flutter/material.dart';
void main() {
runApp(new TabBarDemo());
}
class TabBarDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
home: new DefaultTabController(
length: 3,
child: new Scaffold(
appBar: new AppBar(
bottom: new TabBar(
tabs: [
new Tab(icon: new Icon(Icons.directions_car)),
new Tab(icon: new Icon(Icons.directions_transit)),
new Tab(icon: new Icon(Icons.directions_bike)),
],
),
title: new Text('Tabs Demo'),
),
body: new TabBarView(
children: [
new Icon(Icons.directions_car),
new Icon(Icons.directions_transit),
new Icon(Icons.directions_bike),
],
),
),
),
);
}
}
但事情就是这样,我想获得活动的tab索引,以便我可以在某些选项卡上应用一些逻辑。我搜索文档,但我无法弄清楚。你们能帮帮忙吗?