How to pass parameter to FormType constructor from controller

Thanks for your time! i resolved this myself:

I removed parameter from NewsType constructor and added data to postedBy form field using $options array, and passed data to $options array from controller, please check following:

NewsType

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('postedBy', HiddenType::class, array(
            'data' => $options['postedBy']
          )
        )
    ;
}

// WARNING: this is a MANDATORY block! Only options described here will be allowed to be passed.
public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults(array(
        'postedBy' => null,
    ));
}

Controller

$form = $this->createForm(NewsType::class, $news, array(
    'postedBy' => $this->getUser()->getFullname(),
);

UPDATE:
Please use below code if you want to access $options array from addEventListener:

$builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
    $postedBy = $event->getForm()->getConfig()->getOptions()['postedBy'];
}

Hope it helps somebody!