Localization completely broken in IOS apps

[nevse]

Description

It's impossible to add more than one additional language to an ios app.

Localization resx files are ignored for 2 and more additional languages when an ios app was built in release and run on device.

I created a simple app, source code available here. It contains three resx files (Resources/MyLocalization.resx, Resources/MyLocalization.de.resx, Resource/MyLocailzation.es.resx) which I use to obtain the localized string "MyString" in the following way:

        Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture = new CultureInfo("de");
        CultureStringLabel.Text = resourceManager.GetString("MyString");

It works fine when I build my app in release for an iphone simulator, but it doesn't work when I build it in release for a real device. It works only for one additional resx file.

Steps to Reproduce

1. create an app from the default template: dotnet new maui
2. add three buttons and create handlers for them

 <ScrollView>
      <VerticalStackLayout
          Spacing="25"
          Padding="30,0"
          VerticalOptions="Center">

          <Button Text="Set Eng Culture" Clicked="OnSetEngCulture" />
          <Button Text="Set De Culture" Clicked="OnSetDeCulture" />
          <Button Text="Set Es Culture" Clicked="OnSetEsCulture" />
          <Label x:Name="CultureStringLabel" />
      </VerticalStackLayout>
  </ScrollView>

private void OnSetEngCulture(object sender, EventArgs e)
{
      Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
      CultureStringLabel.Text = resourceManager.GetString("MyString");
}
private void OnSetDeCulture(object sender, EventArgs e)
{
Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture = new CultureInfo("de");
      CultureStringLabel.Text = resourceManager.GetString("MyString");
  }
  private void OnSetEsCulture(object sender, EventArgs e)
  {
      Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture = new CultureInfo("es");
      CultureStringLabel.Text = resourceManager.GetString("MyString");
  }

3. build the app in release and run on the real iphone device

Press each button - you should see different strings (string from eng, string from de, string from es).

Press "Set Eng Culture" to see "string from eng".
Press "Set De Culture" you should see the "string from de", but this string is "string from eng". It's wrong behaviour.
Press "Set Es Culture" to see "string from es".

Link to public reproduction project repository

https://github.com/nevse/maui-tests-iosreleaselocalization

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

ios 16

Did you find any workaround?

No response

Relevant log output

No response

[jfversluis]

Is this maybe related or the same as dotnet/macios#16847?

@rolfbjarne ?

[rolfbjarne]

Is this maybe related or the same as xamarin/xamarin-macios#16847?

@rolfbjarne ?

No, this is something different, and I can reproduce it.

Add this to the project file to work around it:

<PropertyGroup>
    <EnableAssemblyILStripping>false</EnableAssemblyILStripping>
</PropertyGroup>

[rolfbjarne]

This issue was moved to dotnet/macios#17262