nalexn

// Copyright © 2019 Alexey Naumov. MIT License

import Foundation

enum Loadable<Value> {
    case notRequested
    case isLoading(prevValue: Value?)
    case loaded(Value)
    case failed(Error)
}

nalexn

class ValueConsumer {

    private var subscription1: AnyCancellable?
    private var subscription2: AnyCancellable?
    private var subscription3: AnyCancellable?
    private let mySubject = CurrentValueSubject<Int, Never>(0)
    private var myVar: Int = 0

    func consumeValues(publisher1, ...) {
        subscription1 = publisher1

nalexn

class ValueConsumer {

    private var subscriptions = Set<AnyCancellable>()
    
    private let mySubject = CurrentValueSubject<Int, Never>(0)
    private var myVar: Int = 0

    func consumeValues(publisher1, ...) {
        publisher1
            .sink { print("New value: \($0)") }

nalexn

class ValueConsumer {

    private var subscriptions = Set<AnyCancellable>()
    
    private let mySubject = CurrentValueSubject<Int, Never>(0)
    private var myVar: Int = 0

    func consumeValues(publisher1, ...) {
        subscriptions.collect {
            publisher1

nalexn

struct Podcast: Equatable {
    let title: String
    let previewImage: UIImage
    let podcastURL: URL
}

nalexn

protocol PodcastsService {
    func loadPodcasts(completion: (Result<[Podcast], Error>) -> Void)
}

nalexn

class PodcastsViewModel {

    private let service: PodcastsService
    
    let podcasts = BehaviorRelay<[Podcast]>(value: [])
    
    func loadPodcasts() {
        service.loadPodcasts { [weak self] result in
            let records = result.value ?? []
            self?.podcasts.accept(records)

nalexn

class PodcastCell: UITableViewCell {

    func populate(podcast: Podcast) {
        textLabel?.text = podcast.title
        imageView?.image = podcast.previewImage
    }
}

nalexn

class PodcastsViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!
    var viewModel: PodcastsViewModel!
    var disposeBag = DisposeBag()
    
    func viewDidLoad() {
        super.viewDidLoad()
        let cellIdentifier = String(describing: PodcastCell.self)
        tableView.register(PodcastCell.self, forCellReuseIdentifier: cellIdentifier)

nalexn

class PodcastsViewModel {

    private let service: PodcastsService
    
    let podcasts = BehaviorRelay<[Podcast]>(value: [])
    let isLoading = BehaviorRelay<Bool>(value: false)
    let onError = PublishRelay<Error> = PublishRelay()
    
    func loadPodcasts() {
        isLoading.accept(true)