public FormatterInterface::view(FieldItemListInterface $items, $langcode = NULL)
Builds a renderable array for a fully themed field.
\Drupal\Core\Field\FieldItemListInterface $items: The field values to be rendered.
string $langcode: (optional) The language that should be used to render the field. Defaults to the current content language.
array A renderable array for a themed field with its label and all its values.
public function view(FieldItemListInterface $items, $langcode = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FormatterInterface.php/function/FormatterInterface::view/8.1.x