Visibility binding fails - visibility

Question

I try to use the Visibility plugin with the FieldBinding plugin with no luck.
Model side:
/// <summary>
/// Gets or sets the birthdate.
/// </summary>
/// <value>
/// The birthdate.
/// </value>
public DateTime? Birthdate { get; set; }
ViewModel side:
public class DisplayUserViewModel : BaseUserViewModel
{
/// <summary>
/// The user
/// </summary>
public readonly INC<User> User = new NC<User>();
}
View side, first try:
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="#dimen/ListIconTwoLineTileHeight"
android:paddingRight="#dimen/ListIconTwoLineTextMarginRight"
local:MvxBind="Visibility User.Birthdate, Converter=Visibility">
Second try:
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="#dimen/ListIconTwoLineTileHeight"
android:paddingRight="#dimen/ListIconTwoLineTextMarginRight"
local:MvxBind="Visibility Visibility(User.Birthdate)">
But same result:
MvxBind ( 2574): 33.60 Failed to create target binding for binding Visibility for MvxValueConverterValueCombiner combiner-operation
I just took the birthdate as an example, but every Visibility bindings failed (I have x error messages for x bindings).
EDIT 1
The others binding work, I bind a bunch of text, and all display well:
<TextView
style="#style/TextView.ListWithIcon.Single"
android:layout_marginTop="#dimen/ListIconTwoLineTextMarginTop"
local:MvxBind="Text User.FirstName" />
I also try to bind to a INPC property, same result.
EDIT 2
As suggested by stuart, i tried this:
<TextView
style="#style/TextView.ListWithIcon.Single"
android:layout_marginTop="#dimen/ListIconTwoLineTextMarginTop"
android:layout_marginLeft="#dimen/ListIconTextMarginLeft"
local:MvxBind="Text Visibility(User.Birthdate)">
And the visibility converter on TextView seems to work, if Birthdate is null:
Birthdate: Gone
But it does not seem to bind to the visibility property:
<TextView
style="#style/TextView.ListWithIcon.SecondLine"
android:layout_below="#+id/Birthday"
local:MvxBind="Visibility Visibility(User.Birthdate)"
android:text="Whatever birthdate" />
Displays "Whatever birthdate" whereas Visibility(User.Birthdate) returns Gone...
EDIT 3
If you use Visible pseudo-property everything works as expected.
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="#dimen/ListIconTwoLineTileHeight"
android:paddingRight="#dimen/ListIconTwoLineTextMarginRight"
local:MvxBind="Visible User.Birthdate">

Answer 1

I had the same issue with a LinearLayout:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:background="#color/white"
local:MvxBind="Visibility Visibility(IsLoading)">
Visibility of the LinearLayout wouldn't bind to my view model:
Failed to create target binding for binding Visibility for MvxValueConverterValueCombiner combiner-operation
Solution: add an entry to LinkerPleaseInclude.cs so the Visibility property isn't stripped from the view:
public void Include(LinearLayout layout)
{
layout.Click += (s, e) => layout.Visibility = layout.Visibility - 1;
}

Answer 2

There are 2 scenarios:
If you use MvvmCross 5 and below you need to use:
a) local:MvxBind="Visibility Visibility(User.Birthdate)" in your view
b) add a VisibilityPluginBootstrap.cs file in you Bootstrap folder that would look like this:
using MvvmCross.Platform.Plugins;
namespace YourNameSpace.Droid.Bootstrap
{
public class VisibilityPluginBootstrap
: MvxPluginBootstrapAction<MvvmCross.Plugins.Visibility.PluginLoader>
{
}
}
If you use MvvmCross 6 and above you need to use only:
local:MvxBind="Visible User.Birthdate" in your view
and don't need a Bootstrap file: