CreatorExtensionSample.swift

extension OptionsViewController {
    class func create(completionBlock: @escaping OptionsCompletionHandler) -> UIViewController? {
        let storyboard = UIStoryboard(name: "Options", bundle: nil)
        guard let vc =
            storyboard.instantiateViewController(withIdentifier:"OptionsViewController") as? OptionsViewController else {
            return nil
        }
        vc.completionBlock = completionBlock
        return vc
    }
}