Generic Swift methods to load ViewControllers from UIStoryboard

UIStoryboard+GenericViewController.swift

import UIKit

fileprivate enum Storyboard : String {
    case main = "Main" // storyboard name
}

fileprivate extension UIStoryboard {
    
    static func loadFromMain<T>(_ identifier: String) -> T {
        return load(from: .main, identifier: identifier)
    }
    
    static func load<T>(from storyboard: Storyboard, identifier: String) -> T {
        let uiStoryboard = UIStoryboard(name: storyboard.rawValue, bundle: nil)
        return uiStoryboard.instantiateViewController(withIdentifier: identifier) as! T
    }
}

/**
 Public enum for all view controllers with corresponding storyboar id
 
    - type: String
 */
public enum Screen: String {
    case Login = "LoginViewController"
    case Home = "HomeViewController"
    case Contact = "ContactViewController"
    case Gallery = "GalleryViewController"
}

/**
    Stroyboard extension for loading view controllers
 */
extension UIStoryboard {
   
    static func loadViewController<T>(screen: Screen, asClass: T.Type) -> T {
        return loadFromMain(screen.rawValue)
    }
    
    static func loadViewController<T>(screen: Screen) -> T {
        return loadFromMain(screen.rawValue)
    }
}

/*
  // use it like
let vc1 = UIStoryboard.loadViewController(Screen.Login, asClass: LoginViewController.self)

// or
let vc2: HomeViewController = UIStoryboard.loadViewController(Screen.Home)

// did you noticed? you didn't even need to initialize the storyboard ;)
*/