Navigation between pages bottom nav-bar flutter?-CodePudding

I am using flutter. I would like to navigate between pages of bottom nav-bar from inside the body of page. Not to create a new screen on top of it. And carry data between pages. I am using classic bottom navbar in flutter with pages in body of scaffold.

Something like this.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.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({super.key});

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

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  int _selectedIndex = 0;
  static const TextStyle optionStyle =
      TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
  static const List<Widget> _widgetOptions = <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;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('BottomNavigationBar Sample'),
      ),
      body: Center(
        child: _widgetOptions.elementAt(_selectedIndex),
      ),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            label: 'Business',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            label: 'School',
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.amber[800],
        onTap: _onItemTapped,
      ),
    );
  }
}

I tried pageview but with that I can switch between pages only on swipe and cant send data between them.

CodePudding user response：

you can simply simulate running the _onItemTapped() with the index of your target navigation item, in your search button icon onPressed, add this:

onPressed: () {
//...
_onItemTapped(2); // replace 2 with you screen index.
}

this will navigate to the search page programmatically.

CodePudding user response：

you can also get that widget from other places with A GlobalKey :

First, create a GlobalKey in the global scope ( make it outside you StatefulWidegt class )

final glbKey = GlobalKey();

then assign that key to BottomNavigationBar :

   bottomNavigationBar: BottomNavigationBar(
          key: glbKey,
        items: const <BottomNavigationBarItem>[
   // ...

Now, you can call it from your onPressed method like this:

   onPressed: () {
     //...
     BottomNavigationBar navigationBar = glbKey.currentWidget as BottomNavigationBar;
     navigationBar.onTap!(2); // change 2 with index of your target screen

       }