Want to hide Bottom Navigation bar on Scroll in Flutter? This solution is just a workaround to this problem. There may be some detrimental changes.
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import 'package:flutter/material.dart'; import 'package:flutter/rendering.dart'; void main() { runApp(new MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( title: 'Flutter Demo', theme: new ThemeData( primarySwatch: Colors.blue, ), home: new MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => new _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { ScrollController _hideButtonController; var _isVisible; @override initState() { super.initState(); _isVisible = true; _hideButtonController = new ScrollController(); _hideButtonController.addListener(() { if (_hideButtonController.position.userScrollDirection == ScrollDirection.reverse) { if(_isVisible) setState(() { _isVisible = false; print("**** $_isVisible up"); }); } if (_hideButtonController.position.userScrollDirection == ScrollDirection.forward) { if(!_isVisible) setState(() { _isVisible = true; print("**** $_isVisible down"); }); } }); } @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text(widget.title), ), body: new Center( child: new CustomScrollView( controller: _hideButtonController, shrinkWrap: true, slivers: <Widget>[ new SliverPadding( padding: const EdgeInsets.all(20.0), sliver: new SliverList( delegate: new SliverChildListDelegate( <Widget>[ const Text('I\'m dedicating every day to you'), const Text('Domestic life was never quite my style'), const Text('When you smile, you knock me out, I fall apart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('And I thought I was so smart'), const Text('I realize I am crazy'), ], ), ), ), ], )), bottomNavigationBar: AnimatedContainer( duration: Duration(milliseconds: 500), height: _isVisible ? 60.0 : 0.0, child: _isVisible ? new BottomNavigationBar( type: BottomNavigationBarType.fixed, items: [ new BottomNavigationBarItem( icon: Icon(Icons.home), title: Text('Home'), ), new BottomNavigationBarItem( icon: Icon(Icons.card_giftcard), title: Text('Offers'), ), new BottomNavigationBarItem( icon: Icon(Icons.account_box), title: Text('Account'), ), ], currentIndex: 0, ) : Container( color: Colors.white, width: MediaQuery.of(context).size.width, ), ), ); } } |
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