Extension to article

Extensions.swift

extension UIViewController {
    func startLoading() {
        let storyboard = UIStoryboard(name: LoadingViewController.storyboard, bundle: nil)
        if let loadingViewController = storyboard.instantiateViewController(withIdentifier: LoadingViewController.viewControllerId) as? LoadingViewController {
            loadingViewController.modalPresentationStyle = .overCurrentContext
            present(loadingViewController, animated: true, completion: nil)
        }
    }
}