yii2-swiftmailer/extensions/yii/gii/generators/crud/form.php

<?php
/**
 * @var yii\web\View $this
 * @var yii\widgets\ActiveForm $form
 * @var yii\gii\generators\crud\Generator $generator
 */

echo $form->field($generator, 'modelClass');
echo $form->field($generator, 'searchModelClass');
echo $form->field($generator, 'controllerClass');
echo $form->field($generator, 'baseControllerClass');
echo $form->field($generator, 'moduleID');
echo $form->field($generator, 'indexWidgetType')->dropDownList([
	'grid' => 'GridView',
	'list' => 'ListView',
]);