openquestions-1.0.x-dev/src/Plugin/Field/FieldFormatter/QuestionOptionsFormatter.php

<?php

namespace Drupal\openquestions\Plugin\Field\FieldFormatter;

use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\FormatterBase;

/**
 * Plugin implementation of the 'OQ Question Options' formatter.
 *
 * @FieldFormatter(
 *   id = "openquestions_question_options_formatter",
 *   label = @Translation("OQ Question Options"),
 *   module = "openquestions",
 *   field_types = {
 *     "openquestions_question_options"
 *   }
 * )
 */
class QuestionOptionsFormatter extends FormatterBase {

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $element = [];

    foreach ($items as $delta => $item) {
      $element[$delta] = [
        '#markup' => $item->value,
      ];
    }

    return $element;
  }

}