iOS IPA build terminated at launch - symbol not found _$sSS10FoundationE19_bridgeToObjectiveCSo8NSStringCyF

[joemicmc]

Description

If you update the MaulSample.csproj to build as an IPA, the built app terminates at launch with a 'symbol not found _$sSS10FoundationE19_bridgeToObjectiveCSo8NSStringCyF' error.

The full error report is attached MauiSample-2025-07-31-171249.txt

The forked repository includes the following property group in the project file:

<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net9.0-ios|AnyCPU'">
	<ProvisioningType>automatic</ProvisioningType>
	<ArchiveOnBuild>true</ArchiveOnBuild>
	<BuildIpa>True</BuildIpa>
</PropertyGroup>

Steps to Reproduce

1. Open the newBinding.sln solution from this fork here https://github.com/joemicmc/Maui.NativeLibraryInterop/tree/main/template
2. In the subdirectory sample run dotnet publish -f net9.0-ios -c Release
3. Deploy to a physical iOS device
4. Run the app
5. The app crashes

Link to public reproduction project repository

https://github.com/joemicmc/Maui.NativeLibraryInterop/tree/main/template/sample

Environment

• OS: MacOS Sequoia 15.5
• .NET MAUI: 9.0.100
• Target platforms: iOS 18.1

[joemicmc]

Believe the problem could be that I'm targeting iOS 18.1 and the physical device I'm deploying to is iOS 15.8.4.

Not entirely sure if the target platform should be set to minimum. Maybe I misunderstand those settings.

As per the documentation here https://learn.microsoft.com/en-gb/dotnet/communitytoolkit/maui/native-library-interop/get-started

The Xcode project is located at template/macios/native/NewBinding.

Update the Xcode project to reflect the target platforms and versions as supported in your .NET app. In the Xcode project, click on the top-level framework, and in Targets > General:

1. Add/remove any Support Destinations as needed.
2. Adjust the iOS version as needed.

dotnet/macios#20919

[joemicmc]

It was fairly straight forward to fix in the end, had to set the minimum deployment to iOS 15.6.

I think this should work in the template out of the box though.

• In MauiSample.csproj the support OS platform version is iOS 12.2
• In the NewBinding.xcodeproj the minimum deployments is set to iOS 17

I'm not sure which file / property this is actually stored in as not too familiar with Xcode.