我找了很长时间,没有找到任何与我目前面临的问题匹配的案例。
我有一个子类MvxFragmentActivity (MainRootView.cs/.axml)包含一个Android导航抽屉布局:
public class MainRootView : MvxFragmentActivity, IFragmentHost
{
...
protected override void OnViewModelSet ()
{
base.OnViewModelSet ();
SetContentView (Resource.Layout.MainRootView);
...
}
在Setup.cs中,我定义了一个自定义演示器来控制加载新viewModel时显示的片段:
public interface IFragmentHost
{
bool Show (MvxViewModelRequest request);
}
public interface ICustomPresenter
{
void Register (Type viewModelType, IFragmentHost host);
}
public class CustomPresenter : MvxAndroidViewPresenter, ICustomPresenter
{
private Dictionary<Type, IFragmentHost> dictionary = new Dictionary<Type, IFragmentHost>();
public override void Show (MvxViewModelRequest request)
{
IFragmentHost host;
if (this.dictionary.TryGetValue (request.ViewModelType, out host))
{
if (host.Show (request))
{
return;
}
}
base.Show (request);
}
public void Register(Type viewModelType, IFragmentHost host)
{
this.dictionary [viewModelType] = host;
}
}
现在-在MainRootView.cs -我实现了一个特定的ViewModelRequest的显示方法,并替换框架布局内容与一个特定的片段:
public bool Show(Cirrious.MvvmCross.ViewModels.MvxViewModelRequest request)
{
if (request.ViewModelType == typeof(OneCertainViewModel))
{
var loaderService = Mvx.Resolve<IMvxViewModelLoader> ();
var viewModel = loaderService.LoadViewModel (request, null);
var oneCertainFragment = new OneCertainFragment ();
oneCertainFragment.ViewModel = viewModel;
var ft = SupportFragmentManager.BeginTransaction ();
ft.Replace (Resource.Id.flMainContent, oneCertainFragment);
ft.Commit ();
return true;
}
...
}
片段代码看起来像这样:
public class HubFragment : MvxFragment
{
...
public override global::Android.Views.View OnCreateView(global::Android.Views.LayoutInflater inflater,
global::Android.Views.ViewGroup container,
Bundle savedInstanceState)
{
var ignored = base.OnCreateView(inflater, container, savedInstanceState);
global::Android.Views.View view = this.BindingInflate(Resource.Layout.HubFragment, null);
return view;
}
...
此片段包含少量动态创建的自定义子视图,每个子视图都与一个单独的视图模型相关,该视图模型在创建后被设置。
public class SubSectionView : LinearLayout, IHubSectionView
{
private MySubViewModel _vm;
public void SetContentViewModel (MySubViewModel vm)
{
_vm = vm;
...
}
现在如何将TextView的属性绑定到我之前设置的viewModel的属性,如果这是可能的?
非常感谢您的建议!
我希望了解你的情况,我有你的问题在完全相同的形式:我有一个ViewModel与另一个SubViewModel作为属性;设为:MySubView
假设我们有一个这样的主视图:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
...
<Mvx.MvxFrameControl
android:layout_width="fill_parent"
android:layout_height="wrap_content"
local:MvxBind="DataContext MySubView"
local:MvxTemplate="@layout/subview"/>
...
</RelativeLayout>
使用MvxFrameControl是这里的关键。它将我们的属性绑定并传递给指定的模板。在这里,我们可以使用SubViewModel的属性。
所以我们只需要在主视图模型中定义MySubView
:
public class MainViewModel : MvxViewModel
{
...
private SubViewModel _mySubView = new SubViewModel();
public SubViewModel MySubView
{
get { return _mySubView; }
set { _mySubView = value; RaisePropertyChanged(() => MySubView); }
}
...
}
希望能有所帮助。