Hide bottom navigation bar on scroll down and vice versa

Screenshot (Null safe + Optimized)

---

Code:

class MyPage extends StatefulWidget {
  @override
  State<MyPage> createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> {
  late final ScrollListener _model;
  late final ScrollController _controller;
  final double _bottomNavBarHeight = 56;

  @override
  void initState() {
    super.initState();
    _controller = ScrollController();
    _model = ScrollListener.initialise(_controller);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: AnimatedBuilder(
        animation: _model,
        builder: (context, child) {
          return Stack(
            children: [
              ListView.builder(
                controller: _controller,
                itemCount: 20,
                itemBuilder: (_, i) => ListTile(title: Text('Item $i')),
              ),
              Positioned(
                left: 0,
                right: 0,
                bottom: _model.bottom,
                child: _bottomNavBar,
              ),
            ],
          );
        },
      ),
    );
  }

  Widget get _bottomNavBar {
    return SizedBox(
      height: _bottomNavBarHeight,
      child: BottomNavigationBar(
        backgroundColor: Colors.amber,
        items: [
          BottomNavigationBarItem(icon: Icon(Icons.call), label: 'Call'),
          BottomNavigationBarItem(icon: Icon(Icons.message), label: 'Message'),
        ],
      ),
    );
  }
}

class ScrollListener extends ChangeNotifier {
  double bottom = 0;
  double _last = 0;

  ScrollListener.initialise(ScrollController controller, [double height = 56]) {
    controller.addListener(() {
      final current = controller.offset;
      bottom += _last - current;
      if (bottom <= -height) bottom = -height;
      if (bottom >= 0) bottom = 0;
      _last = current;
      if (bottom <= 0 && bottom >= -height) notifyListeners();
    });
  }
}

Working code with BottomNavigationBar.

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ScrollController _hideBottomNavController;

  bool _isVisible;

  @override
  initState() {
    super.initState();
    _isVisible = true;
    _hideBottomNavController = ScrollController();
    _hideBottomNavController.addListener(
      () {
        if (_hideBottomNavController.position.userScrollDirection ==
            ScrollDirection.reverse) {
          if (_isVisible)
            setState(() {
              _isVisible = false;
            });
        }
        if (_hideBottomNavController.position.userScrollDirection ==
            ScrollDirection.forward) {
          if (!_isVisible)
            setState(() {
              _isVisible = true;
            });
        }
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: CustomScrollView(
          controller: _hideBottomNavController,
          shrinkWrap: true,
          slivers: <Widget>[
            SliverPadding(
              padding: const EdgeInsets.all(10.0),
              sliver: SliverList(
                delegate: SliverChildBuilderDelegate(
                  (context, index) => _getItem(context),
                  childCount: 20,
                ),
              ),
            ),
          ],
        ),
      ),
      bottomNavigationBar: AnimatedContainer(
        duration: Duration(milliseconds: 500),
        height: _isVisible ? 56.0 : 0.0,
        child: Wrap(
          children: <Widget>[
            BottomNavigationBar(
              type: BottomNavigationBarType.fixed,
              backgroundColor: Colors.blue,
              fixedColor: Colors.white,
              unselectedItemColor: Colors.white,
              items: [
                BottomNavigationBarItem(
                  icon: Icon(Icons.home),
                  title: Text('Home'),
                ),
                BottomNavigationBarItem(
                  icon: Icon(Icons.card_giftcard),
                  title: Text('Offers'),
                ),
                BottomNavigationBarItem(
                  icon: Icon(Icons.account_box),
                  title: Text('Account'),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  _getItem(BuildContext context) {
    return Card(
      elevation: 3,
      margin: EdgeInsets.all(8),
      child: Row(
        children: <Widget>[
          Expanded(
            child: Container(
              padding: EdgeInsets.all(8),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Text(
                      'Item',
                      style:
                          TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                    ),
                  )
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

Working Model

While Naveen's solution works perfectly, I didn't like the idea of using setState to handle the visibility of the navbar. Every time the user would change scroll direction, the entire homepage including the appbar and body would rebuild which can be an expensive operation. I created a separate class to handle the visibility that uses a ValueNotifier to track the current hidden status.

class HideNavbar {
  final ScrollController controller = ScrollController();
  final ValueNotifier<bool> visible = ValueNotifier<bool>(true);

  HideNavbar() {
    visible.value = true;
    controller.addListener(
      () {
        if (controller.position.userScrollDirection ==
            ScrollDirection.reverse) {
          if (visible.value) {
            visible.value = false;
          }
        }

        if (controller.position.userScrollDirection ==
            ScrollDirection.forward) {
          if (!visible.value) {
            visible.value = true;
          }
        }
      },
    );
  }

  void dispose() {
    controller.dispose();
    visible.dispose();
  }
}

Now all you do is create a final instance of HideNavbar in your HomePage widget.

final HideNavbar hiding = HideNavbar();

Now pass the instance's ScrollController to the ListView or CustomScrollView body of your Scaffold.

body: CustomScrollView(
          controller: hiding.controller,
          ...

Then surround your bottomNavigationBar with a ValueListenableBuilder that takes the ValueNotifier from the HideNavbar instance and then set the height property of the bottomNavigationBar to be either 0 or any other value depending on the status of the ValueNotifier.

bottomNavigationBar: ValueListenableBuilder(
        valueListenable: hiding.visible,
        builder: (context, bool value, child) => AnimatedContainer(
          duration: Duration(milliseconds: 500),
          height: value ? kBottomNavigationBarHeight : 0.0,
          child: Wrap(
            children: <Widget>[
              BottomNavigationBar(
                type: BottomNavigationBarType.fixed,
                backgroundColor: Colors.blue,
                fixedColor: Colors.white,
                unselectedItemColor: Colors.white,
                items: const [
                  BottomNavigationBarItem(
                    icon: Icon(Icons.home),
                    title: Text('Home'),
                  ),
                  BottomNavigationBarItem(
                    icon: Icon(Icons.card_giftcard),
                    title: Text('Offers'),
                  ),
                  BottomNavigationBarItem(
                    icon: Icon(Icons.account_box),
                    title: Text('Account'),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),

This approaches keeps avoids countless rebuilds and doesn't require any external libraries. You can also implement this as a stream-based approach but that would require another library such as dart:async and would not be changing anything. Make sure to call the dispose function of HideNavbar inside HomePage's dispose function to clear all resources used.