Get class with special string identifier on Runtime. Handful if you need to load dynamically a class according to some runtime value.

RuntimeClass.swift

struct RuntimeClass {
  private static var appName: String {
    return Bundle.main.infoDictionary![kCFBundleNameKey as String] as! String
  }
  
  enum Class {
    case Example
    
    fileprivate var name: String {
      switch self {
      case .Example:
        return "Example"
      }
    }
  }
  
  enum RuntimeClassErrors: Error {
    case ClassNotFound
  }
  
  /// Returns the class needed according to the identifier. Casting of class should be done from the receiver. Throws error in case a market file with that name doesn't exist.
  static func getRuntimeClass(class runtimeClass: Class, identifier: String) throws -> AnyClass? {
    let className = appName + "." + runtimeClass.name + identifier
    
    guard let runtimeClass = NSClassFromString(className) else {
      throw RuntimeClassErrors.ClassNotFound
    }
    
    return runtimeClass
  }
}

This is an example of how to use it:

do { let exampleType = try RuntimeClass. getRuntimeClass(class: MarketFile.File.Example, identifier: "MX") as? Example.Type exampleClass = exampleType?.init() } catch { fatalError("\(error)") }

In this case, Example is a protocol that gets implemented by different classes named ExampleMX, ExampleUS, ExampleES, etc.