C# Xamarin.Android MVVMCross上的MvxSpinner绑定问题
将Xamarin.Android与MVVMCross一起使用。从MVXSpinner中选择不绑定到模型中的C# Xamarin.Android MVVMCross上的MvxSpinner绑定问题,c#,xamarin,mvvmcross,C#,Xamarin,Mvvmcross,将Xamarin.Android与MVVMCross一起使用。从MVXSpinner中选择不绑定到模型中的SelectedYear属性的值时。加载页面时,调试器进入SelectedYear属性,但当我从微调器中选择所需的值时,调试器进入SelectedYear。我没有收到任何错误。请任何人告诉我哪里错了 在输出窗口上发现绑定问题 MvxBind:警告:228.30未能为绑定SelectedYear的SelectedItem创建目标绑定 [0:]MvxBind:警告:228.30未能为绑定Sele
SelectedYear
属性的值时。加载页面时,调试器进入SelectedYear
属性,但当我从微调器中选择所需的值时,调试器进入SelectedYear
。我没有收到任何错误。请任何人告诉我哪里错了
在输出窗口上发现绑定问题
MvxBind:警告:228.30未能为绑定SelectedYear的SelectedItem创建目标绑定
[0:]MvxBind:警告:228.30未能为绑定SelectedYear的SelectedItem创建目标绑定
11-09 11:50:03.756 I/mono标准输出(32419):MvxBind:警告:228.30未能为绑定SelectedYear的SelectedItem创建目标绑定
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:orientation="vertical"
android:layout_alignParentRight="true"
android:layout_marginRight="50dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Retread.Collection.UI.DroidPhone.DotYear"
style="@style/LabelTextView" />
<MvxSpinner
android:id="@+id/txtYear"
android:layout_width="20dp"
android:layout_height="wrap_content"
android:overlapAnchor="false"
local:MvxItemTemplate="@drawable/year_spinner"
local:MvxDropDownItemTemplate="@drawable/year_spinnerdropdown"
android:hint="@string/Retread.Collection.UI.DroidPhone.Year"
local:MvxBind="ItemsSource Year;SelectedItem SelectedYear"
style="@style/AppSpinnerStyle" />
也许如果我发布一些对我有用的东西,它可以为你指明正确的方向 微调器:
<Mvx.MvxSpinner
style="@style/spinner"
android:background="@drawable/spinner_selector"
local:MvxItemTemplate="@layout/item_spinner"
local:MvxBind="ItemsSource Position; SelectedItem SelectedPosition"
android:id="@+id/positionSpinner" />
回答这里
您需要从调用MVXAPPCompativeSetupHelper.FillTargetFactorys
您的Setup.cs。也许有一种方法我们可以通过这个插件来实现自动化
建筑
你没有弄清楚这里出了什么问题。预期的结果是什么?你看到了什么?为什么错了?预期结果是当我发布表单时,我需要SelectedYear属性中的绑定值(selected value)。但是我在SelectedYear属性中没有得到任何值(null)。我看到的是,当我从下拉列表中选择一个值时,从ViewModel中触发的无事件到SelectedYear属性。我不知道我哪里弄错了。给我们看看你的YearModel代码。虽然这个链接可以回答这个问题,但最好在这里包含答案的基本部分,并提供链接供参考。如果链接页面发生更改,仅链接的答案可能无效。-@maazza不是已经有答案了吗?“您需要从Setup.cs调用MVXAPPCompativeSetupHelper.FillTargetFactorys”
<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
style="?android:attr/spinnerDropDownItemStyle"
android:singleLine="true"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:ellipsize="marquee"
local:MvxBind="Text DisplayYear" />
private List<YearModel> _Year;
public List<YearModel> Year
{
get
{
return _Year;
}
set
{
_Year = value;
RaisePropertyChanged(() => Year);
}
}
public YearModel SelectedYear
{
get
{
return Model.SelectedYear;
}
set
{
Model.SelectedYear = value;
RaisePropertyChanged(() => SelectedYear);
}
}
<Mvx.MvxSpinner
style="@style/spinner"
android:background="@drawable/spinner_selector"
local:MvxItemTemplate="@layout/item_spinner"
local:MvxBind="ItemsSource Position; SelectedItem SelectedPosition"
android:id="@+id/positionSpinner" />
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
style="@style/Spinner.MyPlayers"
android:singleLine="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/dummy_title"
local:MvxBind="Text Caption" />
protected int SelectedPositionId
{
get { return SelectedPosition == null ? 1 : SelectedPosition.Index; }
}
protected SpinnerItem _selectedPosition;
public virtual SpinnerItem SelectedPosition
{
get { return _selectedPosition; }
set
{
if (_selectedPosition != value)
{
_selectedPosition = value;
SettingsPreferences.SelectedPosition = SelectedPositionId;
RebuildLists(true);
RaisePropertyChanged(() => SelectedPosition);
RaisePropertyChanged(() => DisplayCleanSheets);
RaisePropertyChanged(() => FilteredPlayers);
}
}
}
List<SpinnerItem> _position;
public List<SpinnerItem> Position
{
get
{
if (_position != null)
return _position;
_position = new List<SpinnerItem>();
var values = (int[])Enum.GetValues(typeof(PositionEnumeration));
foreach (var val in values.Where(p => p > 0))
_position.Add(new SpinnerItem(val, SharedTextSource.GetText(Enum.GetName(typeof(PositionEnumeration), val))));
return _position;
}
}
public class SpinnerItem
{
public SpinnerItem(int index, string caption, int primaryKeyId = 0, string tag = "")
{
Index = index;
Caption = caption;
PrimaryKeyId = primaryKeyId;
Tag = tag;
}
public int Index { get; private set; }
public string Caption { get; private set; }
public string Tag { get; private set; }
public int PrimaryKeyId { get; private set; }
public override string ToString()
{
return Caption;
}
public override bool Equals(object obj)
{
var rhs = obj as SpinnerItem;
if (rhs == null)
return false;
return rhs.Caption == Caption;
}
public override int GetHashCode()
{
return Caption == null ? 0 : Caption.GetHashCode();
}
}