您确实不应该在控制器中使用__construct。
相反，您应该使用与baseController相同的结构和iniController，这样您就可以访问请求响应和记录器。

use CodeIgniter\RESTful\ResourceController;
use App\Controllers\BaseController;
use CodeIgniter\HTTP\IncomingRequest;
use CodeIgniter\HTTP\Response;

class SomeName extends ResourceController {

    public function initController(\CodeIgniter\HTTP\RequestInterface $request, \CodeIgniter\HTTP\ResponseInterface $response, \Psr\Log\LoggerInterface $logger) {
        $this->request->getVar('key'); //Not works
    }

    public function index() {
        $this->request->getVar('key'); //Works
    }
}

如果你真的想使用__construct，那么你必须按照这里所说的去做，但是你可以使用服务助手，这样它的方式会更干净，如下所示：

use CodeIgniter\RESTful\ResourceController;
use App\Controllers\BaseController;
use CodeIgniter\HTTP\IncomingRequest;
use CodeIgniter\HTTP\Response;

class SomeName extends ResourceController {
    
   public function __construct() {
       service('request')->getVar('key'); //Now it works
   }
}

解决方案：

use CodeIgniter\RESTful\ResourceController;
use App\Controllers\BaseController;
use CodeIgniter\HTTP\IncomingRequest;
use CodeIgniter\HTTP\Response;
use Config\Services;

class SomeName extends ResourceController {
    protected $request;

    public function __construct() {
            $this->request = Services::request();

            $this->request->getVar('key'); //Now it works
    }

    public function index() {
            $this->request->getVar('key'); //Works
    }
}