Rx 스타일의 사고 방식

수업 설명

요소 클래스

struct VoiceItem {
    var user: String
    var message: String
}

셀 클래스

class VoiceCell: UITableViewCell {

    @IBOutlet weak var userLabel: UILabel!
    @IBOutlet weak var messageLabel: UILabel!

    func item(_ newValue: VoiceItem) {
        userLabel.text = newValue.user
        messageLabel.text = newValue.message        
    }
}

요소 관리 클래스

class VoiceModel {
    let itemsEvent = Variable<[VoiceItem]>([])
    var items: Observable<[VoiceItem]> {
        return itemsEvent.asObservable()
    }

    var rx_items: AnyObserver<String> {
        return AnyObserver<String>(eventHandler: { (e) in
            self.addItem(item: VoiceItem(user: "A", message: e.element!))
            self.addItem(item: VoiceItem(user: "B", message: e.element! + "ですか！すごーい！"))
        })
    }

    init() {
    }

    func addItem(item: VoiceItem) {
        itemsEvent.value.append(item)
    }
}

ViewController 클래스

class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var send: UIButton!

    let disposeBag = DisposeBag()
    let model = VoiceModel()    

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        // TableViewと要素の配列
        model.items.bindTo(self.tableView.rx.items(cellIdentifier: "Cell", cellType: VoiceCell.self)) { (row, element, cell) in
            cell.item(element)
        }.disposed(by: disposeBag)

        // 送信ボタンを押す
        self.send.rx.tap.map{ self.textField.text ?? "" }.bindTo(model.rx_items).disposed(by: disposeBag)
        self.send.rx.tap.subscribe(onNext: { _ in
            self.textField.text = nil
        }).disposed(by: disposeBag)

        // text入力された時とボタンの有効
        self.textField.rx.text.map { ($0?.characters.count)! > 0 }.bindTo(self.send.rx.isEnabled).disposed(by: disposeBag)

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

TableView 및 요소 배열

model.items.bindTo()

self.tableView.rx.items(cellIdentifier: "Cell", cellType: VoiceCell.self)) { (row, element, cell) in
            cell.item(element)
        }