ViewController+Failable.Swift

// MARK: - ViewController Default implementation
extension Failable where Self: ViewController {

  func showError<T: ErrorDisplayable>(_ error: Swift.Error?, errorView: T.Type, _ reloadable: Reloadable) {
    self.errorView = errorView.show(fromView: self.view, insets: .zero, animated: true, completion: nil)

    if var errorViewRetryable = self.errorView as? ErrorRetryable {
      errorViewRetryable.retry = { reloadable.reloadData() }
      errorViewRetryable.message = error?.localizedMessage
    }
  }

  func showError(_ error: Swift.Error?, _ reloadable: Reloadable & Failable) {
    if let reloadable = reloadable as? ViewController {
      reloadable.progressView?.hide()
    }
    if !reloadable.hasData {
      if let errorView = reloadable.errorScreenType?.errorView {
        self.showError(error, errorView: errorView, reloadable)
      } else {
        self.showAlertController(message: error?.localizedMessage ?? L10n.commonErrorMessage, retryCompletion: {
          reloadable.reloadData()
        })
      }
    } else {

      var errorMessage: String
      if reloadable.errorContext == .dataOriented {
        errorMessage = L10n.commonErrorStatusOldData
        SwiftMessages.showAlert(title: errorMessage)
      } else {
        if let errorView = reloadable.errorScreenType?.errorView {
          self.showError(error, errorView: errorView, reloadable)
        } else {
          //Anything
        }
      }
    }
  }
}