flutter_bnb_tut

.\lib\main.dart

import 'package:flutter/material.dart';
import 'package:flutter_bnb_tut/content.dart';
// ...
class _MainPageState extends State<MainPage> {
  int _currentIndex = 0;

  final List<Widget> _children = [
    ContentPage(title: "Home Page"),
    ContentPage(title: "Messages Page"),
    ContentPage(title: "Profile Page")
  ];

  void _onBottomNavBarTab(int index) {
    setState(() {
      _currentIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    // ...
  }
}