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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | 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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