public func authorizeSafariEmbedded(from controller: UIViewController, at url: URL) throws -> SFSafariViewController {
		safariViewDelegate = OAuth2SFViewControllerDelegate(authorizer: self)
		let web = SFSafariViewController(url: url)
		web.title = oauth2.authConfig.ui.title
		web.delegate = safariViewDelegate as! OAuth2SFViewControllerDelegate
		//controller.addChild(web)
		controller.view.addSubview(web.view)

		web.didMove(toParent: controller)
        web.view.translatesAutoresizingMaskIntoConstraints = false
		if #available(iOS 11.0, *) {
			web.view.topAnchor.constraint(equalTo: controller.view.safeAreaLayoutGuide.topAnchor, constant: 30).isActive = true
			web.view.bottomAnchor.constraint(equalTo: controller.view.safeAreaLayoutGuide.bottomAnchor, constant: -30).isActive = true
			web.view.leadingAnchor.constraint(equalTo: controller.view.safeAreaLayoutGuide.leadingAnchor, constant: 30).isActive = true
			web.view.trailingAnchor.constraint(equalTo: controller.view.safeAreaLayoutGuide.trailingAnchor, constant: -30).isActive = true
		} else {
			// Fallback on earlier versions
		}



		web.modalPresentationStyle = oauth2.authConfig.ui.modalPresentationStyle

		willPresent(viewController: web, in: nil)

		controller.present(web, animated: false,completion: nil)

		return web
	}