Weird way to find if a view controller is modally presented.

UIViewControllerModalExtension.swift

    func isModal() -> Bool {
        if let presentingViewController = self.presentingViewController {
            return true
        }
        if let presentingViewController = self.presentingViewController?.presentedViewController {
            let exists = (presentingViewController === self)
            if exists { return true }
        }
        if let presentedNavViewController = self.navigationController?.presentingViewController?.presentedViewController {
            let exists = (presentedNavViewController === self)
            if exists { return true }
        }
        if let tabBarController = self.tabBarController?.presentingViewController?.isKindOfClass(UITabBarController) {
            return true
        }
        return false
    }