Question

我能够将数组_limitQuickPosts绑定到我的微调器。但是我很难弄清楚如何将Selected绑定到我的_selectedLimitQuickPosts。无论我做什么，我都无法让所选的值为＆＃34;显示最近200篇帖子＆＃34;。

Core ViewModel：

private string[] _limitQuickPosts = new string[4]
{
    "Show last 25 Posts",
    "Show last 50 Posts",
    "Show last 100 Posts",
    "Show last 200 Posts"
};
public string[] LimitQuickPosts 
{
    get { return _limitQuickPosts; }
    set { _limitQuickPosts = value; RaisePropertyChanged(() => LimitQuickPosts); }
}

private string _selectedLimitQuickPosts = "Show last 200 Posts";
public string SelectedLimitQuickPosts 
{
    get { return _selectedLimitQuickPosts; }
    set { _selectedLimitQuickPosts = value; RaisePropertyChanged(() => SelectedLimitQuickPosts); }
}

Droid布局：

<MvxSpinner
        android:layout_width="210dp"
        android:layout_height="wrap_content"
        android:textSize="40dp"
        android:id="@+id/limitSelect"
        android:minWidth="50dp"
        android:layout_marginLeft="10dp" />

Droid View：

...
var limitSelect = fragView.FindViewById<MvxSpinner>(Resource.Id.limitSelect);
...
...
set.Bind(limitSelect).For(x => x.ItemsSource).To(vm => vm.LimitQuickPosts);
set.Bind(limitSelect).For(x => x.Selected).To(vm => vm.SelectedLimitQuickPosts);

虽然它适当地将LimitQuickPosts绑定到Spinner，并且我可以看到所有可用的选择，但我仍然不知道Selected如何绑定以及我必须做些什么才能正确绑定？

Answer 1

请参阅此问题：Issue binding to MVXSpinner after upgrading to Mvvmcross v4.0.0-beta3

您必须从Setup.cs的FillTargetFactories（）

中调用MvxAppCompatSetupHelper.FillTargetFactories

Answer 2

问题是：

set.Bind(limitSelect).For(x => x.Selected).To(vm => vm.SelectedLimitQuickPosts);

应该是：

set.Bind(limitSelect).For(x => x.SelectedItem).To(vm => vm.SelectedLimitQuickPosts);

将Selected替换为SelectedItem并且工作正常

Xamarin Android Spinner绑定选择不起作用

2 个答案: