eofster

protocol Service {}
class RealService: Service {}

class Client {
    let service: Service

    init() {
        service = RealService()
    }
}

eofster

protocol Service {}
class RealService: Service {}

class Client {
    let service: Service

    init(service: Service) {
        self.service = service
    }
}

eofster

import Foundation
import XCTest

//////////////////////////////////////////////////////////////////////

// Preferences

protocol UserDefaults {
    func stringForKey(key: String) -> String
}

eofster

class ViewController: UIViewController {
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == PhotoDetailViewControllerIdentifier {
            if let viewController = segue.destinationViewController as? PhotoDetailViewController {
                viewController.photo = Photo()
            }
        }
    }
}

eofster

class ViewController: UIViewController {
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == PhotoDetailViewControllerIdentifier,
            let viewController = segue.destinationViewController as? PhotoDetailViewController {
                viewController.photo = Photo()
        }
    }
}

eofster

class PhotoDetailViewController2: UIViewController {
    let photo: Photo

    init(photo: Photo) {
        self.photo = photo
        super.init(nibName: "PhotoDetailViewController2", bundle: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) is not supported")

eofster

class ViewController2: UIViewController {
    func showDetailWithPhoto(photo: Photo) {
        showViewController(PhotoDetailViewController2(photo: photo), sender: self)
    }
}

eofster

class PhotoDetailViewController: UIViewController {
    var photo: Photo!
}

eofster

import CoreData
import UIKit

struct Photo {}

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

eofster

class Wireframe {
    let navigationController: UINavigationController
    let viewControllerFactory: ViewControllerFactory

    init(navigationController: UINavigationController, viewControllerFactory: ViewControllerFactory) {
        self.navigationController = navigationController
        self.viewControllerFactory = viewControllerFactory
    }

    func presentPhotoDetailsWithPhoto(photo: Photo) {