The HTTP method used by the request building or processing this form. May be any valid HTTP method. Defaults to 'GET', because even though $method

public static FormStateInterface::hasAnyErrors()

Provides an interface for validating form submissions. Hierarchy interface \Drupal\Core\Form\

Encapsulates the caching of a form and its form state. Hierarchy class \Drupal\Core\Form\

public FormStateValuesTrait::unsetValue($key)

public FormState::setLimitValidationErrors($limit_validation_errors)

public FormStateInterface::setResponse(Response $response)

public FormStateDecoratorBase::disableRedirect($no_redirect

A logger instance. Type: \Psr\Log\LoggerInterface File

public FormStateInterface::getTemporary()