Extension on UIStoryboard to simplify programmatic instantiation

UIStoryboard+InstantiateViaNameAndType.swift

import UIKit

extension UIStoryboard {
    
    enum Name: String {
        
        case main = "Main"
        case otherStuff = "OtherStuff"
    }
    
    /// Convenience method to create view controller objects that you want to manipulate and present programmatically in your application, that consults the `Name` enum to located the storyboard file and references the `UIViewController.Type` to identify the view controller and conditionally cast the instance to that type. This method creates a new instance of the specified view controller each time you call it.
    /// - Warning: Before you can use this method to instantiate a view controller, you must:
    /// 1. ensure that the controller is created in a storyboard file represented in the `Name` enum
    /// 1. set its Storyboard ID to the view controller's `Type` in Interface Builder (e.g., `"MyViewController"`)
    ///
    /// - Parameters:
    ///   - name: `Name` case representing storyboard file name where the view controller is created (`default = .main`)
    ///   - type: the view controller's `Type` (e.g., `MyViewController.self`)
    /// - Returns: A new instance of the view controller conditionally casted as the `type` specified
    static func instantiateViewController<T>(inStoryboardNamed name: Name = .main, ofType type: T.Type) -> T? {
        return UIStoryboard(name: name.rawValue, bundle: nil).instantiateViewController(withIdentifier: String(describing: type.self)) as? T
    }
}

Usage examples:

Instantiate view controller of type MyViewController in a Main.storyboard (the default) with the storyboard ID "MyViewController":

guard let controller = UIStoryboard.instantiateViewController(ofType: MyViewController.self) else { return }

Instantiate view controller of type MyViewController in a OtherStuff.storyboard with the storyboard ID "MyViewController":

guard let controller = UIStoryboard.instantiateViewController(inStoryboardNamed: .otherStuff, ofType: MyViewController.self) else { return }