Symfony2 -提交后重置表单域

// 表单类
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('field1')
            ->add('field2')
            // 添加其他表单字段
        ;
    }
}

// 控制器
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;

class MyController extends AbstractController
{
    public function submitForm(Request $request)
    {
        $form = $this->createForm(MyFormType::class);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            // 处理表单提交

            // 重置表单域
            $form->setData(null);
        }

        return $this->render('my_template.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}