MVVMCross中的RadioGroup實現

Question

我有以下xml和ViewModel源代碼。我正在研究radiogroup，我有兩個單選按鈕（男性和女性）。最初，我想要選擇Male單選按鈕（默認）。但是，我目前的實現並沒有顯示任何單選按鈕被選中。他們兩個都顯示爲未selected.I現在用MvvmCross版本4.0

XML

<mvvmcross.droid.support.v7.appcompat.widget.MvxAppCompatRadioGroup 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:orientation="horizontal" 
    local:MvxItemTemplate="@layout/item_radio" 
    local:MvxBind="ItemsSource Items;ItemSelected SelectedItem" /> 

Item_radio.xml

<?xml version="1.0" encoding="utf-8"?> 
<RadioButton xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:local="http://schemas.android.com/apk/res-auto" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:textSize="12sp" 
    local:MvxBind="Text Caption" /> 

ViewModel.cs

private List<Thing> _items = new List<Thing>() 
{ 
    new Thing("Male"), 
    new Thing("Female"), 
}; 

public List<Thing> Items 
{ 
    get { return _items; } 
    set { _items = value; RaisePropertyChanged(() => Items); } 
} 

private Thing _selectedItem = new Thing("Male"); 
public Thing SelectedItem 
{ 
    get 
    { 
    return _selectedItem; 
    } 
    set 
    { 
    _selectedItem = value; 
    RaisePropertyChanged(() => SelectedItem); 
    } 
} 

在Setup.cs

registry.RegisterFactory(new MvxCustomBindingFactory<MvxAppCompatRadioGroup>("ItemSelected", view => new MyRadioItemSelectedBinding(view))); 

Answer 1

這個問題似乎是你被綁定到ItemSelected，而不是SelectedItem。

你的XML佈局控制應該是：

<mvvmcross.droid.support.v7.appcompat.widget.MvxAppCompatRadioGroup 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:orientation="horizontal" 
    local:MvxItemTemplate="@layout/item_radio" 
    local:MvxBind="ItemsSource Items; SelectedItem SelectedItem" />