DataProvider.php

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<?php
namespace Magento\Cms\Model\Page;

use Magento\Cms\Model\ResourceModel\Page\CollectionFactory;
use Magento\Framework\App\Request\DataPersistorInterface;
use Magento\Ui\DataProvider\Modifier\PoolInterface;

class DataProvider extends \Magento\Ui\DataProvider\ModifierPoolDataProvider
{
    protected $collection;

    protected $dataPersistor;

    protected $loadedData;

    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        CollectionFactory $pageCollectionFactory,
        DataPersistorInterface $dataPersistor,
        array $meta = [],
        array $data = [],
        PoolInterface $pool = null
    ) {
        $this->collection = $pageCollectionFactory->create();
        $this->dataPersistor = $dataPersistor;
        parent::__construct($name, $primaryFieldName, $requestFieldName, $meta, $data, $pool);
        $this->meta = $this->prepareMeta($this->meta);
    }

    public function prepareMeta(array $meta)
    {
        return $meta;
    }

    public function getData()
    {
        if (isset($this->loadedData)) {
            return $this->loadedData;
        }
        $items = $this->collection->getItems();
        foreach ($items as $page) {
            $this->loadedData[$page->getId()] = $page->getData();
        }

        $data = $this->dataPersistor->get('cms_page');
        if (!empty($data)) {
            $page = $this->collection->getNewEmptyItem();
            $page->setData($data);
            $this->loadedData[$page->getId()] = $page->getData();
            $this->dataPersistor->clear('cms_page');
        }

        return $this->loadedData;
    }
}