Instating view controller from storyboard in easier way

UIStoryboard-Extensions.swift

extension UIStoryboard {

    func instantiateViewController<T: UIViewController>() -> T {

        let viewController = self.instantiateViewController(withIdentifier: T.className)
        guard let typedViewController = viewController as? T else {
            fatalError("Unable to cast view controller of type (\(type(of: viewController))) to (\(T.className))")
        }
        return typedViewController
    }
}

extension NSObject {

    static var className: String {
        return String(describing: self)
    }
}

// Example
// Inside storyboard add new UIViewController, set custom class and set StoryboardID to match class. 
// For example I'll use UIViewController's subclass named: ProductDetailsViewController
// When you want to instante new ProductDetailsViewController you have two options (cases):

// 1. Case where current viewController and ProductDetailsViewController share the same UIStoryboard file
let controller: ProductDetailsViewController = self.storyboard!.instantiateViewController()

// 2. Case where current viewController and ProductDetailsViewController are in different UIStoryboard files
let controller: ProductDetailsViewController = UIStoryboard(name: "storyboard_name", bundle: nil).instantiateViewController()