如何使用MVVM / RxSwift根据其他单元格的值更新表视图的单元格？

我建议您对ViewModel进行一些更改，以便可以更好地控制文本字段中的更改。如果您从用户名，密码和确认之类的输入字段创建流，则可以订阅更改并以所需的任何方式对其做出反应。

这是我为重组文本字段而使用的代码的方式。

internal enum FormElement {
    case textInput(placeholder: String, variable: Variable<String>)
    case button(title: String)
}

ViewModel。

internal class ViewModel {

    let username = Variable("")
    let password = Variable("")
    let confirmation = Variable("")

    lazy var formElementsVariable: Driver<[FormElement]> = {
        return Observable<[FormElement]>.of([.textInput(placeholder: "username",
                                                          variable: username),
                                               .textInput(placeholder: "password",
                                                          variable: password),
                                               .textInput(placeholder: "password, again",
                                                          variable: confirmation),
                                               .button(title: "create account")])
            .asDriver(onErrorJustReturn: [])
    }()

    lazy var isFormValid: Driver<Bool> = {
        let usernameObservable = username.asObservable()
        let passwordObservable = password.asObservable()
        let confirmationObservable = confirmation.asObservable()

        return Observable.combineLatest(usernameObservable,
                                        passwordObservable,
                                        confirmationObservable) { [unowned self] username, password, confirmation in
                                            return self.validateFields(username: username,
                                                                       password: password,
                                                                       confirmation: confirmation)
            }.asDriver(onErrorJustReturn: false)
    }()

    fileprivate func validateFields(username: String,
                                    password: String,
                                    confirmation: String) -> Bool {

        guard username.count > 0,
            password.count > 0,
            password == confirmation else {
                return false
        }

        // do other validations here

        return true
    }
}

ViewController，

internal class ViewController: UIViewController {
    @IBOutlet var tableView: UITableView!

    fileprivate var viewModel = ViewModel()

    fileprivate let disposeBag = DisposeBag()

    override func viewDidLoad() {
        super.viewDidLoad()

        viewModel.formElementsVariable.drive(tableView.rx.items) { [unowned self] (tableView: UITableView, index: Int, element: FormElement) in

                let indexPath = IndexPath(row: index, section: 0)

                switch element {

                case .textInput(let placeholder, let variable):

                    let cell = self.createTextInputCell(at: indexPath,
                                                        placeholder: placeholder)

                    cell.textField.text = variable.value
                    cell.textField.rx.text.orEmpty
                        .bind(to: variable)
                        .disposed(by: cell.disposeBag)
                    return cell

                case .button(let title):
                    let cell = self.createButtonCell(at: indexPath,
                                                     title: title)
                    self.viewModel.isFormValid.drive(cell.button.rx.isEnabled)
                        .disposed(by: cell.disposeBag)
                    return cell
                }
            }.disposed(by: disposeBag)
    }

    fileprivate func createTextInputCell(at indexPath:IndexPath,
                                         placeholder: String) -> TextInputTableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "TextInputTableViewCell",
                                                 for: indexPath) as! TextInputTableViewCell
        cell.textField.placeholder = placeholder
        return cell
    }

    fileprivate func createButtonCell(at indexPath:IndexPath,
                                      title: String) -> ButtonInputTableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "ButtonInputTableViewCell",
                                                 for: indexPath) as! ButtonInputTableViewCell
        cell.button.setTitle(title, for: .normal)
        return cell
    }
}

我们基于三个不同的变量来启用禁用按钮，您可以在此处看到stream和rx运算符的功能。

我认为在我们的情况下，将普通属性更改为用户名，密码和passwordField时，将普通属性转换为Rx总是很好。您可以看到formElementsVariable并没有太大变化，除了用于创建单元格的神奇tableview绑定之外，它没有Rx的真正附加值。