<?php
namespace Kai\Banner\Controller\Adminhtml\Index;

use Magento\Backend\App\Action;

class Index extends Action
{
    protected $resultPageFactory = false;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory
    ) {
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        $resultPage = $this->resultPageFactory->create();
        $resultPage->getConfig()->getTitle()->prepend(__('Banner'));
        return $resultPage;
    }
}