Flow Controllers

Presentation in french I gave on Flow Controllers at a Paris Swift Meetup.

Transcript

1. FLOW CONTROLLERS
2. LES PROBLÈMES AVEC LES VIEW CONTROLLERS ! TROP DE RESPONSABILITÉS > fort couplage & faible réutilisabilité ! > difficile à tester ! > massif "
3. PRATIQUE COURANTE @IBAction func didTapShareButton() { let shareViewController = ShareViewController() if Env.IsIPad { shareViewController.modalPresentationStyle = .FormSheet self.presentViewController(shareViewController, animated: true, completion: nil) } else { self.navigationController?.pushViewController(shareViewController, animated: true) } }
4. In real life, children should never tell their parents what to do. In programming, I would argue children shouldn’t even know who their parents are! — Soroush Khanlou
5. In real life, children should never tell their parents what to do. In programming, I would argue children shouldn’t even know who their parents are! — Ali Karagoz
6. FLOW CONTROLLER WALKS INTO A BAR (!)
7. WHAT IS A FLOW CONTROLLER C'est un objet qui manage des view controllers et qui est responsable de leur instanciation, presentation et disparition
8. FLOW CONTROLLERS EN PRATIQUE > manage le navigation flow de l'application > gère un ou plusieurs view controllers > peut avoir des flow controllers enfant ! > manipule la data
9. SANS FLOW CONTROLLER chaque view controller connait sa position dans le navigation flow et sait instancier le view controller suivant
10. AVEC FLOW CONTROLLER
11. FLOW D'UNE APPLICATION
12. HOW DO YOU EVEN FLOW CONTROLLER ? BRO
13. /// It's a simple class class FlowController { }
14. class FlowController { /// Usually initialized with a `UINavigationControlller`, but not only init(navigationController navigationController: UINavigationController) { self.navigationController = navigationController super.init() } }
15. class ViewController: UIViewController { } /// `ViewController` has a delegate to "talk" to the outside protocol ViewControllerDelegate { func didTapButton(viewController: ViewController) }
16. /// The flow controller implements the delegate and is reponsible of the flow extension FlowController: ViewControllerDelegate { func didTapButton(viewController: ViewController) { let otherViewController = OtherViewController() otherViewController.delegate = self self.navigationController?.pushViewController(otherNavigationController, animated: false) } }
17. class FlowController { init(navigationController navigationController: UINavigationController) { self.navigationController = navigationController super.init() } /// `start()` is just here to make setup the root view controller and eventually decide which /// child flow controller should be instantiated. func start() { let viewController = ViewController() viewController.delegate = self self.navigationController.viewControllers = [viewController] } }
18. let navigationController = UINavigationController() let flowController = FlowController(navigationController: navigationController) flowController.start()
19. FLOW CONTROLLERS EN BREF > moins de responsabilités ! > plus d'isolation & réutilisabilité élevée ! > encapsulation des tâches ! > navigation flow clair !
20. QUESTIONS ?
21. MERCI :-) @ALIKARAGOZ
22. LINKS > Coordinators Redux - Soroush Khanlou > Improve your iOS Architecture with FlowControllers - Krzysztof Zabłocki > Coordinators with Storyboards - Warren Gavin > Flow Controllers on iOS for a Better Navigation Control - Alberto De Bortoli