Easy storyboard & nib initialization by the concrete class from the static method

UIStoryboard + Nib [initialization]

class YourCustomViewController: UIViewController {
    static func storyboardInstance() -> YourCustomViewController? { 
        // if your storyboard's name same as VC name
        let storyboard = UIStoryboard(name: String(describing: self), bundle: nil)
        
        // make concrete storyboard as initial to use this method
        // else, use instantiateViewController(withIdentifier: _ )
        return storyboard.instantiateInitialViewController() as? YourCustomViewController 
    }
}

//============================================================================================

class LoginView: UIView {
    static func nibInstance() -> LoginView? {
        let nib = Bundle.main.loadNibNamed(String(describing: self), owner: nil, options: nil)
        return nib?.first as? LoginView
    }
}

// More general solution

extension UIViewController {
    private class func storyboardInstancePrivate<T: UIViewController>() -> T? {
        let storyboard = UIStoryboard(name: String(describing: self), bundle: nil)
        return storyboard.instantiateInitialViewController() as? T
    }
    class func storyboardInstance() -> Self? {
        return storyboardInstancePrivate()
    }
}