<?php
namespace SR\Banner\Controller\Adminhtml\Banner;

use Magento\Backend\App\Action\Context;
use Magento\Ui\Component\MassAction\Filter;
use SR\Banner\Model\ResourceModel\Banner\CollectionFactory;
use Magento\Framework\Controller\ResultFactory;
use Magento\Framework\App\ResponseInterface;

class MassDelete extends \Magento\Backend\App\Action
{
/**
* @var Filter
*/
protected $filter;

/**
* @var CollectionFactory
*/
protected $collectionFactory;

/**
* @param Context $context
* @param Filter $filter
* @param CollectionFactory $collectionFactory
*/
public function __construct(Context $context, Filter $filter, CollectionFactory $collectionFactory)
{
$this->filter = $filter;
$this->collectionFactory = $collectionFactory;
parent::__construct($context);
}

/**
* Dispatch request
*
* @return \Magento\Framework\Controller\ResultInterface|ResponseInterface
* @throws \Magento\Framework\Exception\NotFoundException
*/
public function execute()
{
$collection = $this->filter->getCollection($this->collectionFactory->create());
echo '<pre>testingone==';
print_r($collection->getData());
exit;
$collectionSize = $collection->getSize();

foreach ($collection as $item) {
$item->delete();
}

$this->messageManager->addSuccess(__('A total of %1 element(s) have been deleted.', $collectionSize));

/** @var \Magento\Backend\Model\View\Result\Redirect $resultRedirect */
$resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
return $resultRedirect->setPath('*/*/');
}
}