Flutter Navigation - How do you set up file pages in index? - flutter

Question

I would like to use different dart files/scripts to show the pages when clicking on the navigation bar. The error is within the final screen section where I have set different pages to be loaded. However methods can't be found and I would like to ask how do I make this appear and all work together?
I have been following this tutorial and he skips what to do when linking up files within the navigation bar.
This is the youtube video I am following: (goto 6:44)
https://www.youtube.com/watch?v=xoKqQjSDZ60
main.dart:
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: MainPage(),
);
}
}
class MainPage extends StatefulWidget {
const MainPage({Key? key}) : super(key: key);
#override
State<MainPage> createState() => _MainPageState();
}
class _MainPageState extends State<MainPage> {
int currentIndex = 0;
final screens = [
HomePage(),
BuisnessPage(),
SchoolPage(),
SettingsPage(),
];
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Bottom Navigation Bar'),
centerTitle: true,
),
body: screens[currentIndex],
bottomNavigationBar: BottomNavigationBar(
backgroundColor: Colors.white70,
selectedItemColor: Colors.white,
unselectedItemColor: Colors.grey,
type: BottomNavigationBarType.fixed,
iconSize: 30,
//selectedFontSize: 16,
//unselectedFontSize: 14,
//showUnselectedLabels: false,
currentIndex: currentIndex,
onTap: (index) => setState(() => currentIndex = index),
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Home',
backgroundColor: Colors.red,
),
BottomNavigationBarItem(
icon: Icon(Icons.business),
label: 'Business',
backgroundColor: Colors.green,
),
BottomNavigationBarItem(
icon: Icon(Icons.school),
label: 'School',
backgroundColor: Colors.purple,
),
BottomNavigationBarItem(
icon: Icon(Icons.settings),
label: 'Settings',
backgroundColor: Colors.pink,
),
],
),
);
}
}
buisnesspage.dart:
import 'package:flutter/material.dart';
class BuisnessPage extends StatelessWidget {
const BuisnessPage({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(
title: Text('Test B'),
),
body: Center(child: Text('Test B', style: TextStyle(fontSize: 60))),
);
}
Error:
lib/main.dart:29:5: Error: Method not found: 'HomePage'.
HomePage(),
^^^^^^^^ lib/main.dart:30:5: Error: Method not found: 'BuisnessPage'.
BuisnessPage(),
^^^^^^^^^^^^ lib/main.dart:31:5: Error: Method not found: 'SchoolPage'.
SchoolPage(),
^^^^^^^^^^ lib/main.dart:32:5: Error: Method not found: 'SettingsPage'.
SettingsPage(),
^^^^^^^^^^^^

Answer 1

I think the problem comes from the fact that you did not import the classes used in main.dart
try to :
import 'pathtoyour/HomePage.dart';
import 'pathtoyour/BuisnessPage.dart';
import 'pathtoyour/SchoolPage.dart';
import 'pathtoyour/SettingsPage.dart';
and also try to type your variables to avoid errors that are difficult to understand,
final List<Widget> screens = const [
HomePage(),
BuisnessPage(),
SchoolPage(),
SettingsPage(),
];
if it's ok, give me a feedback 😊
or at least try to specify what your list contains :
final screens = <Widget>[
HomePage(),
BuisnessPage(),
SchoolPage(),
SettingsPage(),
];