第四天 rxcocoa

HackerNewsReaderDemo

        HackerNewsAPI.sharedApi.newStories()
            .observeOn(ConcurrentDispatchQueueScheduler.init(globalConcurrentQueueQOS: .Background))
            .map { $.dropLast($.count - ).map { HackerNewsAPI.sharedApi.item($) } }
            .map { $.zip({ $ }) }
            .switchLatest()
            .map { $.map { ItemViewModel(item: $) } }
            .observeOn(MainScheduler.instance)
            .doOnNext { [unowned self] _ in
                self.endUpdateTableView()
            }
            .doOnError { [unowned self] _ in
                self.endUpdateTableView()
            }
            .bindTo(tableView.rx_itemsWithCellIdentifier("ItemTableViewCell", cellType: ItemTableViewCell.self)) { (row, item, cell) in
                cell.viewModel = item
            }.addDisposableTo(disposeBag)