To load a UIViewController by the class name, avoiding ! operator and using a string literal for the name of the viewController identifier

UIViewController+Load.swift

//
//  UIViewController+Load.swift
//
//  Created by Rigoberto Sáenz Imbacuán (https://www.linkedin.com/in/rsaenzi/)
//  Copyright © 2019. All rights reserved.
//

import UIKit

extension UIViewController {
    
    /**
     This class function works if the UIViewController class name, the Storyboard file name,
     and the Storyboard Id of the Scene are the same
     */
    static func loadViewController<T: UIViewController>(from bundle: Bundle = .main) -> T {
        
        let identifier = className(some: T.self)
        let storyboard = UIStoryboard(name: identifier, bundle: bundle)
        
        guard let screen = storyboard.instantiateViewController(withIdentifier: identifier) as? T else {
            fatalError("UIViewController with identifier '\(identifier)' was not found")
        }
        return screen
    }
    
    /**
     This method works if the UIViewController class name, the Storyboard file name,
     and the Storyboard Id of the Scene are the same
     */
    func loadViewController<T: UIViewController>(from bundle: Bundle = .main) -> T {
        
        let identifier = className(some: T.self)
        let storyboard = UIStoryboard(name: identifier, bundle: bundle)
        
        guard let screen = storyboard.instantiateViewController(withIdentifier: identifier) as? T else {
            fatalError("UIViewController with identifier '\(identifier)' was not found")
        }
        return screen
    }
}

extension UIViewController {
    
    /**
     Loads the initial UIViewController in the storyboard. This class function works if the
     UIViewController class name, and the Storyboard file name are the same
     */
    static func loadFirstViewController(from bundle: Bundle = .main) -> UIViewController {
        
        let identifier = className(some: self)
        let storyboard = UIStoryboard(name: identifier, bundle: bundle)
        
        guard let screen = storyboard.instantiateInitialViewController() else {
            fatalError("Initial UIViewController with identifier '\(identifier)' was not found")
        }
        return screen
    }
    
    /**
     Loads the initial UIViewController in the storyboard. This method works if the
     UIViewController class name, and the Storyboard file name are the same
     */
    func loadFirstViewController(from bundle: Bundle = .main) -> UIViewController {
        
        let identifier = className(some: self)
        let storyboard = UIStoryboard(name: identifier, bundle: bundle)
        
        guard let screen = storyboard.instantiateInitialViewController() else {
            fatalError("Initial UIViewController with identifier '\(identifier)' was not found")
        }
        return screen
    }
}

extension UIStoryboard {
    
    static func load<T: UIViewController>() -> T {
        
        let sceneId = className(some: T.self)
        let storyboard = UIStoryboard(name: sceneId, bundle: .main)
        
        guard let screen = storyboard.instantiateViewController(withIdentifier: sceneId) as? T else {
            fatalError("No UIViewController with ID \(sceneId) was found")
        }
        return screen
    }
}

UIView+Load.swift
https://gist.github.com/rsaenzi/0c3da9a1f5084c6ac73cee0b501daf33