Otbivnoe

extension UserDefaults {
    subscript<T>(key: String) -> T? {
        get {
            return value(forKey: key) as? T
        }
        set {
            set(newValue, forKey: key)
        }
    }
    

Otbivnoe

import Foundation

let json = """
{
    "businesses": [
        {
        "id": "joes-pizza-new-york-4",
        "name": "Joe's Pizza",
        "image_url": "https://s3-media2.fl.yelpcdn.com/bphoto/FhbFkrh_3TrAOZvoWTyOJA/o.jpg",
        "is_closed": false,

Otbivnoe

final class ProfileRouter: Router<ProfileViewController> {
    typealias Routes = Closable
}

final class ProfileViewController: UIViewController {

    private let router: ProfileRouter.Routes

    init(router: ProfileRouter.Routes) {
        self.router = router

Otbivnoe

protocol ProfileRoute {
    var profileTransition: Transition { get }
    func openProfile(for user: User)
}

extension ProfileRoute where Self: RouterProtocol {

    var profileTransition: Transition {
        return ModalTransition()
    }

Otbivnoe

final class FriendsRouter: Router<FriendsViewController>, FriendsRouter.Routes  {
    typealias Routes = ProfileRoute & /* other routes */ 
}

final class FriendsViewController: UIViewController {

    private let router: FriendsRouter.Routes

    init(router: FriendsRouter.Routes) {
        self.router = router

Otbivnoe

protocol Closable: class {
    func close()
}

protocol RouterProtocol: class {
    associatedtype V: UIViewController
    weak var viewController: V? { get }
    
    func open(_ viewController: UIViewController, transition: Transition)
}

Otbivnoe

protocol Animator: UIViewControllerAnimatedTransitioning {
    var isPresenting: Bool { get set }
}

Otbivnoe

class PushTransition: NSObject {
    var animator: Animator?
    weak var viewController: UIViewController?

    init(animator: Animator? = nil) {
        self.animator = animator
    }
}

extension PushTransition: Transition {}

Otbivnoe

class ModalTransition: NSObject {
    var animator: Animator?
    weak var viewController: UIViewController?

    init(animator: Animator? = nil) {
        self.animator = animator
    }
}

extension ModalTransition: Transition {}

Otbivnoe

protocol Transition: class {
    weak var viewController: UIViewController? { get set }

    func open(_ viewController: UIViewController)
    func close(_ viewController: UIViewController)
}