View controller with property-based dependency injection and abstract factory

ViewControllerWithPropertyBasedDependencyInjectionAndAbstractFactory.swift

import CoreData
import UIKit

struct Photo {}

class PhotoDetailViewController: UIViewController {
    var photo: Photo!
    var context: NSManagedObjectContext!
}

protocol ViewControllerFactory {
    func createPhotoDetailViewControllerWithPhoto(photo: Photo) -> PhotoDetailViewController
}

class StoryboardViewControllerFactory {
    let storyboard: UIStoryboard
    let context: NSManagedObjectContext

    init(storyboard: UIStoryboard, context: NSManagedObjectContext) {
        self.storyboard = storyboard
        self.context = context
    }
}

extension StoryboardViewControllerFactory: ViewControllerFactory {
    func createPhotoDetailViewControllerWithPhoto(photo: Photo) -> PhotoDetailViewController {
        let vc = storyboard.instantiateViewControllerWithIdentifier("PhotoDetailViewController") as! PhotoDetailViewController
        vc.photo = photo
        vc.context = context
        return vc
    }
}

// Usage

let factory: ViewControllerFactory = StoryboardViewControllerFactory(
    storyboard: UIStoryboard(name: "Name", bundle: nil),
    context: NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
)
let vc = factory.createPhotoDetailViewControllerWithPhoto(Photo())
print(vc)