具有非缓存片段的MvxCachingFragmentCompatActivity

Question

我在这里跟踪片段示例https://github.com/MvvmCross/MvvmCross-AndroidSupport。我试图通过在片段上设置IsCacheableFragment属性来创建不可缓存的片段。但是，当我这样做时，ViewModel永远不会被设置。

例如：

 [MvxFragment(typeof(MainViewModel), Resource.Id.content_frame, true, IsCacheableFragment =false)]
 [Register("example.droid.fragments.ExampleRecyclerViewFragment")]
public class ExampleRecyclerViewFragment : BaseFragment<ExampleRecyclerViewModel>
{...

将在OnCreate中抛出错误，因为ViewModel为null

public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
        var view = base.OnCreateView(inflater, container, savedInstanceState);

        var recyclerView = view.FindViewById<MvxRecyclerView>(Resource.Id.my_recycler_view);
        if (recyclerView != null)
        {
            recyclerView.HasFixedSize = true;
            var layoutManager = new LinearLayoutManager(Activity);
            recyclerView.SetLayoutManager(layoutManager);
        }
         //ViewModel is null
        _itemSelectedToken = ViewModel.WeakSubscribe(() => ViewModel.SelectedItem,
            (sender, args) => {
                if (ViewModel.SelectedItem != null)
                    Toast.MakeText(Activity,
                        $"Selected: {ViewModel.SelectedItem.Title}",
                        ToastLength.Short).Show();
            });
         ....

我通过做类似于MvxCachingFragmentCompatActivity refresh cached fragment的事情解决了我的问题。

片段上的属性是否应该按照我的意图执行，还是用于其他内容？