vm.swift

  @IBOutlet weak var titleTextField :BindingTextField! {
        didSet {
            titleTextField.bind { self.viewModel.title.value = $0 }
        }
    }
    @IBOutlet weak var descriptionTextField :BindingTextField! {
        didSet {
            descriptionTextField.bind { self.viewModel.description.value = $0 }
        }
    }