我正在尝试在TabBar
in flutter中获得另一个浮动按钮。但是我会尝试很多选择,但是我不知道怎么做。
抱歉,我添加了更多详细信息:我想使用制作一个应用,TabBar
例如下面的例子。如果您看到这是一个tabBarDemo
应用程序,则可以在选项卡之间进行切换,但是我不知道如何更改选项卡之间的浮动按钮。谢谢
像这样的gif:https : //i.stack.imgur.com/bxtN4.gif
class TabBarDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: DefaultTabController(
length: 3,
child: Scaffold(
appBar: AppBar(
bottom: TabBar(
tabs: [
Tab(icon: Icon(Icons.directions_car)),
Tab(icon: Icon(Icons.directions_transit)),
Tab(icon: Icon(Icons.directions_bike)),
],
),
title: Text('Tabs Demo'),
),
body: TabBarView(
children: [
Icon(Icons.directions_car),
Icon(Icons.directions_transit),
Icon(Icons.directions_bike),
],
),
floatingActionButton: FloatingActionButton.extended
(onPressed: null,
icon: Icon(Icons.add, color: Colors.white,),
label: new Text('FLOATING TO CHANGE'),
),
floatingActionButtonLocation:FloatingActionButtonLocation.centerFloat,
),
),
);
}
}
所需内容的最小示例:
class TabsDemo extends StatefulWidget {
@override
_TabsDemoState createState() => _TabsDemoState();
}
class _TabsDemoState extends State<TabsDemo>
with SingleTickerProviderStateMixin {
TabController _tabController;
@override
void initState() {
super.initState();
_tabController = TabController(length: 2, vsync: this, initialIndex: 0);
_tabController.addListener(_handleTabIndex);
}
@override
void dispose() {
_tabController.removeListener(_handleTabIndex);
_tabController.dispose();
super.dispose();
}
void _handleTabIndex() {
setState(() {});
}
@override
Widget build(BuildContext context) {
return SafeArea(
top: false,
child: Scaffold(
appBar: AppBar(
title: Text('Demo'),
bottom: TabBar(
controller: _tabController,
tabs: [
Tab(
text: "Tab1",
),
Tab(
text: "Tab2",
),
],
),
), // floatingActionButton: _buildFloatingActionButton(context),
body: TabBarView(controller: _tabController, children: [
Center(
child: Container(
child: Text('Tab 1'),
),
),
Center(
child: Container(
child: Text('Tab 2'),
),
),
]),
floatingActionButton: _bottomButtons(),
),
);
}
Widget _bottomButtons() {
return _tabController.index == 0
? FloatingActionButton(
shape: StadiumBorder(),
onPressed: null,
backgroundColor: Colors.redAccent,
child: Icon(
Icons.message,
size: 20.0,
))
: FloatingActionButton(
shape: StadiumBorder(),
onPressed: null,
backgroundColor: Colors.redAccent,
child: Icon(
Icons.edit,
size: 20.0,
),
);
}
}
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