如何在symfony中设置textarea的值

$textareaValue = '要设置的textarea的值';

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

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('textareaField', TextareaType::class);
    }
}

$form = $this->createForm(MyFormType::class);

{{ form_start(form) }}
{{ form_widget(form.textareaField) }}
{{ form_end(form) }}

{{ form_widget(form.textareaField, {'attr': {'value': textareaValue}}) }}