VIPER: Router and wireframe - Class binding

We will see binding of all classes.Let us bind for list view.

Here is a list of classes with whom we are going to interact.
AppDelegate – Standard UIApplicationMain default class.
AppDependencies – A class which has methods to bind all classes.
Root-wireframe - A class which has all possible kind of transition code. (like push, pop, present etc.) List-wireframe - A class knows how to show its UI and all possible forward flow.

And other all classes that we have seen previous are presenter, interactor, view controller and entity. Here is a step by step process to bind all the classes.

Step:1 class name: AppDelegate We create object of dependency class.

let appDependencies = AppDependencies()

Step:2 class name: AppDelegate, With dependency class we call its method.

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        let wireframe = appDependencies.configureDependencies()
        return true
    }

Step:3 class name: AppDependencies  In dependency class we can put all shared instance object and other objects we put it in a method.

class AppDependencies {
    let rootWireFrame = RootWireframe()
    //this is the root object so we need to create here, others go to their own function
    //return value could be replaced with wireframe object

    func configureDependencies() -> listWireFrame {
        let listWireframe = listWireFrame()

        listWireframe.rootWireframe = rootWireFrame
        return listWireframe
    }
}

Step:4 class name: AppDependencies

func configureDependencies() -> listWireFrame {
        let listWireframe = listWireFrame()
 let Presenter = listPresenter()

 listWireframe.rootWireframe = rootWireFrame
 listWireframe.listPresenter = Presenter
 return listWireframe
}

Step:5 class name: AppDependencies

func configureDependencies() -> listWireFrame {
        let listWireframe = listWireFrame()
        let Presenter = listPresenter()
        let Interactor = listInteractor()
        
        listWireframe.listPresenter = Presenter
        Presenter.listInteractor = Interactor
        return listWireframe
    }

Step:6 AppDependencies

func configureDependencies() -> listWireFrame {
        let listWireframe = listWireFrame()
        let Presenter = listPresenter()
        let Interactor = listInteractor()
        
        listWireframe.listPresenter = Presenter
        Presenter.listInteractor = Interactor
        Interactor.output = Presenter
        listWireframe.rootWireframe = rootWireFrame
        return listWireframe
    }

Step:7 class name: AppDelegate

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        let wireframe = appDependencies.configureDependencies()
        wireframe.presentListInterfaceFromWindow(window: window!)
        return true
    }

class name: list-wireframe

func presentListInterfaceFromWindow(window: UIWindow) {
        let viewController = listViewControllerFromStoryboard()
        viewController.eventHandler = listPresenter
        listVC = viewController
        listPresenter!.userInterface = viewController
        rootWireframe?.showRootViewController(viewController: viewController, inWindow: window)
    }

Step:8 class name: list-wireframe

func presentListInterfaceFromWindow(window: UIWindow) {
        let viewController = listViewControllerFromStoryboard()
        viewController.eventHandler = listPresenter
        listVC = viewController
        listPresenter!.userInterface = viewController
        rootWireframe?.showRootViewController(viewController: viewController, inWindow: window)
    }

Here is a full flow of binding of all classes.