未找到Symfony 4 isClicked方法

// src/Form/MyFormType.php
namespace App\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\FormBuilderInterface;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('save', SubmitType::class, ['label' => '保存'])
            ->add('delete', SubmitType::class, ['label' => '删除']);
    }
}

// src/Controller/MyController.php
namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use App\Form\MyFormType;

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

        if ($form->isSubmitted()) {
            if ($form->get('save')->isClicked()) {
                // 处理保存逻辑
            } elseif ($form->get('delete')->isClicked()) {
                // 处理删除逻辑
            }
        }

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

php bin/console cache:clear
composer dump-autoload