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February 17, 2021 07:19
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import UIKit | |
struct Books: Codable {} | |
struct Movies: Codable {} | |
// MARK: - Observer | |
protocol BooksObserver { | |
func received(_ data: Books) | |
//func subscribe(toService service: BooksService) | |
} | |
extension BooksObserver { | |
func subscribe(toService service: BooksService) { | |
service.add(self) | |
} | |
} | |
protocol MoviesObserver { | |
func received(_ data: Movies) | |
//func subscribe(toService service: MoviesService) | |
} | |
extension MoviesObserver { | |
func subscribe(toService service: MoviesService) { | |
service.add(self) | |
} | |
} | |
// MARK: - Service | |
class BooksService { | |
var data: Books? | |
//var observers: [BooksObserver] = .init() | |
func publish() { | |
print() | |
//observers.forEach({ $0.received(data!)} ) | |
} | |
func add(_ observer: BooksObserver) { | |
//observers.append(observer) | |
} | |
} | |
class MoviesService { | |
var data: Movies? | |
//var observers: [MoviesObserver] = .init() | |
func publish() { | |
//observers.forEach({ $0.received(data!)} ) | |
} | |
func add(_ observer: MoviesObserver) { | |
//observers.append(observer) | |
} | |
} | |
// MARK: - Controllers | |
class ViewController: UIViewController { | |
let bookService = BooksService() | |
let movieService = MoviesService() | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
subscribe(toService: bookService) | |
subscribe(toService: movieService) | |
} | |
} | |
extension ViewController: BooksObserver { | |
func received(_ data: Books) { | |
print(data) | |
} | |
} | |
extension ViewController: MoviesObserver { | |
func received(_ data: Movies) { | |
print(data) | |
} | |
} | |
/// | |
/// A possible solution came to my mind. | |
/// | |
/// Class in between publishers and observers, taking capability of publishing and information what are observers away from publisher. | |
/// | |
class Coordinator { | |
private var bookObservers: [BooksObserver] = .init() | |
private var movieObservers: [MoviesObserver] = .init() | |
// will be called from observers - viewControllers | |
func add(_ observer: UIViewController) { | |
if let observer = observer as? BooksObserver { bookObservers.append(observer) } | |
if let observer = observer as? MoviesObserver { movieObservers.append(observer) } | |
} | |
// will be called from publishers | |
func publish(_ data: Codable) { | |
if let data = data as? Books { bookObservers.forEach({ $0.received(data)} )} | |
if let data = data as? Movies { movieObservers.forEach({ $0.received(data)} )} | |
} | |
} |
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