AppStoryboard enumeration

AppStoryboard.swift

//
//  AppStoryboards.swift
//  AppStoryboards
//
//  Created by Gurdeep on 15/12/16.
//  Copyright © 2016 Gurdeep. All rights reserved.
//

import Foundation
import UIKit

enum AppStoryboard: String {
    
    case Main
    
    var instance : UIStoryboard {
        return UIStoryboard(name: self.rawValue, bundle: Bundle.main)
    }
    
    func viewController<T : UIViewController>(_ viewControllerClass : T.Type,
                                              _ function : String = #function,
                                              _ line : Int = #line,
                                              _ file : String = #file) -> T {
        
        
        let storyboardID = (viewControllerClass as UIViewController.Type).storyboardID

        guard let scene = instance.instantiateViewController(withIdentifier: storyboardID) as? T else {
            
            fatalError("ViewController with identifier \(storyboardID), not found in \(self.rawValue) Storyboard.\nFile : \(file) \nLine Number : \(line) \nFunction : \(function)")
        }
        
        return scene
    }
    
    func initialViewController() -> UIViewController? {
        return instance.instantiateInitialViewController()
    }
}

extension UIViewController {
    
    // Not using static as it wont be possible to override to provide custom storyboardID then
    class var storyboardID : String {
        return "\(self)"
    }
    
    static func instantiate(from appStoryboard: AppStoryboard,
                            function : String = #function,
                            line : Int = #line,
                            file : String = #file) -> Self {
        
        return appStoryboard.viewController(self, function, line, file)
    }
}

I like your architecture very much. I implement it right now with "CleanStore" project by Raymond Law. It works very fine as long as I build and run it. But I have an issue with TTD. Running the test raises an error in AppStoryBoards in the guard statement on line 26. I think the reason is that as long as the UIViewController.Type 's module (here "CleanStore.AnyVC" is the app itself there' s no problem. But starting the test, the module is the test module (here "CleanStoreTest.AnyVC"). "StoryBoard ID" 's are set correctly. Can you help please?

Thank you so much man! Keep up the good work!

How to prevent app crashing if view controller is not found in the storyboard which may happen if you specify incorrect storyboard?

thanks for sharing