codeigniter/
├── application/
├── composer.json
├── composer.lock
├── public/
|   ├── themes/
|   |     └── Default
|   |         └── views  
|   |             ├── partial 
|   |             └── layouts  
│   ├── .htaccess
│   └── index.php
└── vendor/
    └── codeigniter/
        └── framework/
            └── system/

我为Codeigniter 4框架自定义了视图助手，以便通过代码模块配置主题。查看图片 ==> 主题布局

安装

composer require fireantlabs/fatheme

前往应用 -> 配置 -> Autoload.php

$psr4 = ['Theme' =>FCPATH.'themes']

配置环境为开发模式 --> 显示调试栏

$_SERVER['CI_ENVIRONMENT'] = 'development';