[Solved] Creating a Custom Flutter Bottom Navigation bar

Question

Asked by Pixxu W on December 30, 2021 (source).

I tried to look for a way of customising my bottom navigation bar as seen in the image. enter image description here

I still cannot get the exact look. I am able to highlight the Icon with the blue box around it when its selected but not with label. is there a way to achieve this or to approach differently ? glad if someone can help with a code snippet.

Answer

Question answered by Mahesh J (source).

Here's my simple solution without any third party package, You can customize this widget, I am sure there's a lot of scope for improvement. Hope this gives you an idea on How to move further.

enter image description here

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: _title,
      home: MyStatefulWidget(),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget>
    with SingleTickerProviderStateMixin {
  int _selectedIndex = 0;
  static const TextStyle optionStyle =
      TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
  static const List<Widget> _bodyView = <Widget>[
    Text(
      'Index 0: Home',
      style: optionStyle,
    ),
    Text(
      'Index 1: Business',
      style: optionStyle,
    ),
    Text(
      'Index 2: School',
      style: optionStyle,
    ),
  ];

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  late TabController _tabController;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _tabController = TabController(vsync: this, length: 3);
  }

  Widget _tabItem(Widget child, String label, {bool isSelected = false}) {
    return AnimatedContainer(
        margin: EdgeInsets.all(8),
        alignment: Alignment.center,
        duration: const Duration(milliseconds: 500),
        decoration: !isSelected
            ? null
            : BoxDecoration(
                borderRadius: BorderRadius.circular(10),
                color: Colors.black,
              ),
        padding: const EdgeInsets.all(10),
        child: Column(
          children: [
            child,
            Text(label, style: TextStyle(fontSize: 8)),
          ],
        ));
  }

  final List<String> _labels = ['Home', 'maps', 'camera'];

  @override
  Widget build(BuildContext context) {
    List<Widget> _icons = const [
      Icon(Icons.home_outlined),
      Icon(Icons.explore_outlined),
      Icon(Icons.camera_alt_outlined)
    ];

    return Scaffold(
      appBar: AppBar(
        title: const Text('BottomNavigationBar Sample'),
      ),
      body: Center(
        child: _bodyView.elementAt(_selectedIndex),
      ),
      bottomNavigationBar: Container(
        height: 100,
        padding: const EdgeInsets.all(12),
        child: ClipRRect(
          borderRadius: BorderRadius.circular(50.0),
          child: Container(
            color: Colors.teal.withOpacity(0.1),
            child: TabBar(
                onTap: (x) {
                  setState(() {
                    _selectedIndex = x;
                  });
                },
                labelColor: Colors.white,
                unselectedLabelColor: Colors.blueGrey,
                indicator: const UnderlineTabIndicator(
                  borderSide: BorderSide.none,
                ),
                tabs: [
                  for (int i = 0; i < _icons.length; i++)
                    _tabItem(
                      _icons[i],
                      _labels[i],
                      isSelected: i == _selectedIndex,
                    ),
                ],
                controller: _tabController),
          ),
        ),
      ),
    );
  }
}

Video Answers on YouTube

DART FLUTTER NAVIGATIONBAR
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