Bottomnavigatorbar is not accepting pages. How to fix?

Question

I’m trying to make an app that uses Bottomnavigatorbar as a tool to navigate between screens, but by placing a page to be executed after clicking on one of the menu icons, it’s returning a string error.

Here is the revealing code to resolve the error The error is in _widgetOptions, where I call one of my created screens.

import 'package:app_work/telas/pendentes.dart';
import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _selectedIndex = 0;
  List<Widget> _widgetOptions = <Widget>[
    Text('Bom Dia'),
    PendentesPage(),
    Text('Boa noite')
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.grey,
      appBar: AppBar(
        backgroundColor: Colors.blue,
        title: Text(widget.title),
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _selectedIndex,
        type: BottomNavigationBarType.fixed,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('Página Inicial'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('Pendentes'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('Concluídas'),
          )
        ],
        selectedItemColor: Colors.blue,
        onTap: (index){
          setState(() {
            _selectedIndex =  index;
          });
        },
      ),
      body: _widgetOptions.elementAt(_selectedIndex),
    );
  }
}

Pendentespage Code()

import 'package:flutter/material.dart';

class PendentesPage extends StatefulWidget {
  PendentesPage({Key key, this.title}) : super(key: key);

  final String title;

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

class _PendentesPageState extends State<PendentesPage> {
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.lightBlue,
      appBar: AppBar(
        backgroundColor: Colors.yellow,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('TESTANDO'),
          ],
        ),
      ),
    );
  }
}

Answer 1

This error is related to the "Text()" Widget, it is occurring because you did not initialize the "widget.title" parameter that is being passed to your "_Myhomepagestate" class through the constructor. You are using it in this class without first initializing it with a value, and where to use 'Myhomepage()' or 'Pendentespage()', declare them as follows: NameClass(title: 'meu titulo'). I think this will solve