MvvmCross Visibility 插件不会隐藏我的 TextView

Question

我正在尝试使用 MvvmCross Visibility 插件使项目不可见。我正在使用 MvvmCross 5.7 和 MvvmCross Visibility 插件 5.7。

我尝试通过布局和瑞士绑定来绑定对象的可见性。

我有一个 ViewModel，它有一个适当的 ShouldShowBackButton：

  public class TabViewModel : MvxViewModel
    {
        private bool _showBackButton;

        public IMvxCommand NavigateCommand => new MvxCommand(this.Act, this.CanAct);

        public bool ShouldShowBackButton
        {
            get => this._showBackButton;

            set
            {
                this._showBackButton = value;
                this.RaisePropertyChanged(() => this.ShouldShowBackButton);
            }
        }

        private void Act()
        {
            this.ShowViewModel<ProfileFragmentViewModel>();
        }

        private bool CanAct()
        {
            return true;
        }
    }

这个 ViewModel 继承自实际的 ViewModel：

 public class ProfileFragmentViewModel : TabViewModel
    {
        public ProfileFragmentViewModel()
        {
            this.ShouldShowBackButton = false;
        }
    }

viewModel 已正确绑定到 View，我已经对其进行了测试。 这是我试图使 TextView 不可见的方式：

    <TextView 
        android:id="@+id/testProp"
        android:layout_width="fill_parent"
        android:layout_height="20dp"
        android:text="Test visibility"
        local:MvxBind="Visibility Visibility(ShouldShowBackButton)" />

还有瑞士法典：

 public class ProfileFragmentView : MvxFragment
    {
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            base.OnCreateView(inflater, container, savedInstanceState);
            var view = this.BindingInflate(Resource.Layout.ProfileFragmentView, null);
            var backButton = view.FindViewById<Button>(Resource.Id.toolbarBackButton);
            var testButton = view.FindViewById<TextView>(Resource.Id.testProp);
            var set = this.CreateBindingSet<ProfileFragmentView, ProfileFragmentViewModel>();

            set.Bind(testButton).For(v => v.Visibility).To(vm => vm.ShouldShowBackButton)
                .WithConversion<MvxVisibilityValueConverter>();

            set.Apply();
            return view;
        }
    }

这两种方法都不会使我的 TextView 不可见。

Answer 1

你应该将你的属性声明为响应式

[Reactive]
public bool ShouldShowBackButton
    {
        get => this._showBackButton;
       ....