Mastering MVVM

ReactiveItemsViewController.swift

class ItemsViewController: UIViewController {
    @IBOutlet private weak var tableView: UITableView!
    private let activityIndicator = ActivityIndicatorView()
    private var viewModel: ItemsViewModel
    
    init(viewModel: ItemsViewModel) {
        self.viewModel = viewModel
        super.init(nibName: nil, bundle: nil)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
        bindViewModel()
        viewModel.fetch()
    }
    
    func bindViewModel() {
        viewModel.refreshing.bind(to: activityIndicator.reactive.isAnimating)
        viewModel.items.bind(to: self) { strongSelf, _ in
            strongSelf.tableView.reloadData()
        }
    }
    
    func setupUI() {
        view.addSubview(activityIndicator)
    }
}

extension ItemsViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return viewModel.items.value.count
    }
}