Flutter - Change between page with bottom navigation bar

PageViewWithPagination.dart

/*
 *  Author: Jorge Wander Santana Urena 
 *  Goal: Screen with page view & bottom pagination to change current page
 **/

// Import material package to use UI
import 'package:flutter/material.dart';

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

// Create statefull widget to use setState to repaint screen on change
class MyApp extends StatefulWidget {
  MyApp({Key key}) : super(key: key);

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

class _MyAppState extends State<MyApp> {
  final int _pageAmount = 3;
  // Create a page controller to change page programmatically
  final _pageController = PageController(initialPage: 0);
  int _selectedPage = 0;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // Init with a scaffold to set a bottom navigation bar
      home: Scaffold(
        // Set a PageView as a body to change between screen on page change
        body: PageView(
          // Disable user iteration to change page programmatically only
          physics: NeverScrollableScrollPhysics(),
          controller: _pageController,
          // Repaint screen on page change
          onPageChanged: (value) => setState(() => _selectedPage = value),
          // Create pages
          children: List<Scaffold>.generate(
              _pageAmount, (index) => _createPage(title: 'Page ${index + 1}')),
        ),
        // Create bottom navigation bar to change page
        bottomNavigationBar: BottomNavigationBar(
          currentIndex: _selectedPage,
          // Change page tap page number
          onTap: (value) => _pageController.animateToPage(value,
              duration: Duration(microseconds: 300), curve: Curves.easeIn),
          // Create page numbers
          items: List<BottomNavigationBarItem>.generate(_pageAmount,
              (index) => _createBottomOption(title: '${index + 1}')),
        ),
      ),
    );
  }

  _createBottomOption({String title}) => BottomNavigationBarItem(
      label: title, icon: Icon(Icons.panorama_wide_angle));

  _createPage({String title}) => Scaffold(
        appBar: AppBar(
          title: Text(title),
        ),
        body: Center(child: Text(title))
      );
}