Extensions to help on UIStoryboard files configurations

UIStoryboard+Extensions.swift

import UIKit

extension UIStoryboard {

  // MARK: - Enums
  /// All the storyboards files names should be added here.
  /// **Important info:** Under the identity inspector on storyboard file, the storyboard id be the class name.
  ///
  /// **Example**
  /// - `profile` represents the storyboard file *Profile.storyboard*
  /// - `cards` represents the storyboard file *Cards.storyboard*
  ///
  ///  **How to use**
  ///  ```
  ///  let navigation = UIStoryboard.cards.instantiateInitialViewController()
  ///  let controller = UIStoryboard.profile.instantiate(ProfileViewController.self)
  ///  ```
  private enum Name: String {
    case profile
    case cards

    private var filename: String {
      rawValue.firstCapitalized
    }

    var storyboard: UIStoryboard {
      UIStoryboard(name: filename, bundle: nil)
    }
  }

  // MARK: - Properties
  static var profile: UIStoryboard { Name.profile.storyboard }
  static var cards: UIStoryboard { Name.cards.storyboard }

  // MARK: - Public Actions
  func instantiate<T>(_ identifier: T.Type) -> T where T: UIViewController {
    let className = String(describing: identifier)

    guard let viewController = instantiateViewController(withIdentifier: className) as? T else {
      fatalError("❌ Cannot find controller with identifier \(className)")
    }

    return viewController
  }
}

extension String {
  var firstCapitalized: String {
    guard let first = first else { return "" }
    return String(first).uppercased() + dropFirst()
  }
}