Article_002 https://nalexn.github.io/mvvm-state-redundancy/

Article_002_MVVM_07.swift

class PodcastsViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var errorMessageLabel: UILabel!
    @IBOutlet weak var indicatorView: UIActivityIndicatorView!
    var viewModel: PodcastsViewModel!
    var disposeBag = DisposeBag()
    
    func viewDidLoad() {
        super.viewDidLoad()
        // ...
        viewModel.isLoading.bind(to: indicatorView.rx.isAnimating).disposed(by: disposeBag)
        viewModel.onError.subscribe(onNext: { [weak self] error in
            self?.errorMessageLabel?.text = error.localizedDescription
        }).disposed(by: disposeBag)
        viewModel.podcasts.map { $0.count > 0 }
          .bind(to: errorMessageLabel.rx.isHidden).disposed(by: disposeBag)
    }
}