Create a new form in a controller

# Create a new form with a default name #

$form = $this->createFormBuilder($data)
->add('dueDate', null, array(
'widget' => 'single_text'))
->add('save', SubmitType::class)
->getForm();

# Create a form with a non-default name #

$form = $this->container->get('form.factory')
->createNamedBuilder(
'form1', FormType::class, $data)
->add('dueDate', null, array(
'widget' => 'single_text'))
->add('save', SubmitType::class)
->getForm();