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Config\Routes.php

<?php

namespace Config;

// Create a new instance of our RouteCollection class.
$routes = Services::routes();

// Load the system's routing file first, so that the app and ENVIRONMENT
// can override as needed.
if (is_file(SYSTEMPATH . 'Config/Routes.php')) {
    require SYSTEMPATH . 'Config/Routes.php';
}

/*
 * --------------------------------------------------------------------
 * Router Setup
 * --------------------------------------------------------------------
 */
$routes->setDefaultNamespace('App\Controllers');
$routes->setDefaultController('Home');
$routes->setDefaultMethod('index');
$routes->setTranslateURIDashes(false);
$routes->set404Override();
// The Auto Routing (Legacy) is very dangerous. It is easy to create vulnerable apps
// where controller filters or CSRF protection are bypassed.
// If you don't want to define all routes, please use the Auto Routing (Improved).
// Set `$autoRoutesImproved` to true in `app/Config/Feature.php` and set the following to true.
//$routes->setAutoRoute(false);

/*
 * --------------------------------------------------------------------
 * Route Definitions
 * --------------------------------------------------------------------
 */

// We get a performance increase by specifying the default
// route since we don't have to scan directories.
$routes->get('/', 'Home::index');
$routes->get('/halo', 'Home::intro');
$routes->get('/article', 'Article::index');
$routes->get('/article/(:any)', 'Article::show/$1');

/*
 * --------------------------------------------------------------------
 * Additional Routing
 * --------------------------------------------------------------------
 *
 * There will often be times that you need additional routing and you
 * need it to be able to override any defaults in this file. Environment
 * based routes is one such time. require() additional route files here
 * to make that happen.
 *
 * You will have access to the $routes object within that file without
 * needing to reload it.
 */
if (is_file(APPPATH . 'Config/' . ENVIRONMENT . '/Routes.php')) {
    require APPPATH . 'Config/' . ENVIRONMENT . '/Routes.php';
}

Controllers\Article.php

<?php

namespace App\Controllers;

use CodeIgniter\Controller;

class Article extends Controller
{

  public function __construct()
  {
    $this->article_model = new \App\Models\Article();
  }

  public function index()
  {
        // ambil artikel yang statusnya bukan draft
        $data['articles'] = $this->article_model->get_published();

        if (count($data['articles']->getResult()) > 0) {
        // kirim data artikel ke view
        return view('articles/list_article.php', $data);
        } else {
        // kalau gak ada artikel, tampilkan view ini
        return view('articles/empty_article.php');
    }
}

  public function show($slug = null)
  {
    // jika gak ada slug di URL tampilkan 404
    if (!$slug) {
        return view('articles/empty_article.php');
    }

    // ambil artikel dengan slug yang diberikan
    $data['article'] = $this->article_model->find_by_slug($slug);

    // jika artikel tidak ditemuakn di database tampilkan 404
    if (!$data['article']) {
        $routes->set404Override('App\Errors::show404');
    }

    // tampilkan artikel


    return view('articles/show_article.php', $data);
  }
}

Models\Article.php

<?php

namespace App\Models;

use CodeIgniter\Model;

class Article extends Model
{
	protected $table      = 'article';

	public function get_published($limit = null, $offset = null)
	{
		if (!$limit && $offset) {
			$query = $this->getWhere(['draft' => 'false']);
		} else {
			$query =  $this->getWhere(['draft' => 'false'], $limit, $offset);
		}
		return $query;
	}

	public function find_by_slug($slug)
	{
		if (!$slug) {
			return;
		}
		$query = $this->getWhere(['slug' => $slug]);
		return $query;
	}
}

Views\articles\empty_article.php

<h1>Tidak ada artikel</h1>

Views\articles\list_article.php

<h1>List Artikel</h1>
<ul>
    <?php foreach ($articles->resultObject as $article) : ?>
        <li>
            <a href="<?= 'article/'.$article->slug ?>">
                <?= $article->title ? $article->title : "No Title" ?>
            </a>
        </li>
    <?php endforeach ?>
</ul>

Views\articles\show_article.php

<h1 class="post-title"><?= $article->getRowObject()->title ? $article->getRowObject()->title : "No Title" ?></h1>
<div class="post-meta">
    Published at <?= $article->getRowObject()->created_at ?>
</div>
<div class="post-body">
    <?= $article->getRowObject()->content ?>
</div>