Xib.swift

protocol XibViewController {
    static var className: String { get }
    static func make() -> Self
}

extension XibViewController where Self: UIViewController {
    static var className: String {
        return String(describing: self).components(separatedBy: ".").last!
    }
    static func make() -> Self {
        return self.init(nibName: Self.className, bundle: nil)
    }
}

extension UIViewController: XibViewController {}