Simple creating viewcintroller instance by instantiateViewControllerWithIdentifier

SimpleViewController.swift

class SimpleViewController: UIViewController, StoryboardInstantiable{
    
    typealias ViewController = SimpleViewController
    static var storyboardID: String { get { return "SimpleViewController" } }
    
    override func viewDidLoad() {
	super.viewDidLoad()
    }
}

UIViewController+StoryboardInstantiable.swift

import Foundation

protocol StoryboardInstantiable {
    typealias ViewController
    static var storyboardID: String { get }
    static func instance(storyboard: UIStoryboard) -> ViewController?
    static func instance(storyboardName: String) -> ViewController?
}

extension StoryboardInstantiable {
    static func instance(storyboard: UIStoryboard) -> ViewController? {
        return storyboard.instantiateViewControllerWithIdentifier(Self.storyboardID) as? ViewController
    }
    
    static func instance(storyboardName: String) -> ViewController? {
        let storyboard = UIStoryboard(name: storyboardName, bundle: nil)
        return storyboard.instantiateViewControllerWithIdentifier(Self.storyboardID) as? ViewController
    }
}