iOS binding returns NULL on .NET8

[Kebechet]

Steps to Reproduce

1. I have created simple example with the bug in this repo
2. Download it and try to run main branch. It contains .NET7 version of the binding Kebechet.Maui.RevenueCat.iOS. In App.xaml.cs L17 put breakpoint and run it on your iPhone. When it reach the breakpoint result should be filled with some value.
3. Now change branch to _net8. This branch has changed versions of the framework to .NET8+ binding with version 4.31.9-preview1 what is the same binding but with changed version of .NET. Ofc before running this remove bin & obj, restore packages and run. In this case when breakpoint is triggered the result contains NULL.

Expected Behavior

.NET8 version should return object as .NET7 one

Actual Behavior

Null is returned from the method Purchases.ConfigureWithAPIKey

Environment

Version information

Microsoft Visual Studio Enterprise 2022
Version 17.8.4
VisualStudio.17.Release/17.8.4+34408.163
Microsoft .NET Framework
Version 4.8.09032

Installed Version: Enterprise

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Build Logs

msbuild.zip

Example Project (If Possible)

Testing project: https://github.com/Kebechet/BugBinding

• testing project contains 2 branches:
  • main - containing working .NET7 test project where in App.xaml.cs call Purchases.ConfigureWithAPIKey returns some value
  • _net8 - .NET8 proejct where the call returns NULL

Binding project: https://github.com/Kebechet/Maui.RevenueCat.iOS

• binding project contains
  • main branch containing working .NET7 binding and
  • NET8 branch which is released in nuget as 4.31.9.1-preview1 and has only changed framework version from NET7 to NET8

[Kebechet]

After some trial and error I was able to make the library work but only with remote device (iPhone connected with cable to MAC into which I am connected remotely from Windows - my main machine).
With Local device (iphone connected to Windows) it keeps giving me NULL.

[rolfbjarne]

The main branch of the test project doesn't compile for me:

error : ld: Undefined symbols: [/Users/rolf/test/bugs/BugBinding/BugBinding/BugBinding.csproj::TargetFramework=net7.0-ios]
error :   _OBJC_CLASS_$_FakeASIdManager, referenced from: [/Users/rolf/test/bugs/BugBinding/BugBinding/BugBinding.csproj::TargetFramework=net7.0-ios]
error :        in registrar.o [/Users/rolf/test/bugs/BugBinding/BugBinding/BugBinding.csproj::TargetFramework=net7.0-ios]
[...]]

which is because it seems the symbol is a mangled symbol:

$ nm /Users/rolf/test/bugs/BugBinding/BugBinding/obj/Debug/net7.0-ios/ios-arm64/linker-cache/RevenueCat.framework/RevenueCat|g _OBJC_CLASS_.*FakeASIdManager
000000000025b0c8 s _OBJC_CLASS_$__TtC10RevenueCat15FakeASIdManager

(this means the native class name is actually _TtC10RevenueCat15FakeASIdManager, not FakeASIdManager).

Also I recommend using the .xcframework shipped by RevenueCat instead of the .framework (this is required to support the simulator on ARM64 macOS machines). There's bit more info here: https://github.com/xamarin/xamarin-macios/wiki/.NET-8-release-notes#default-runtimeidentifiers

[Kebechet]

Thank you for the tip on .xcframework. For now you can probably close this. When I have time I will try to change the binding and if I have still some problems we can reopen this.

[akravch]

Hello @rolfbjarne ,

I am experiencing a similar issue when consuming a binding library from a .NET 8 application. In my case I noticed that NSString constants that used to return something meaningful on .NET 7 now return null.

I too have a repro project here: https://github.com/akravch/IosNet8Binding

In this sample I bind to a PLCrashReporter static library (https://github.com/microsoft/plcrashreporter/releases/tag/1.11.1), but the behaviour seems to be the same regardless of the library.

This sample is supposed to render "PLCrashReporterException" from here, but on .NET 8 it always returns null. Switching the target framework of the consumer project fixes the issue and "PLCrashReporterException" is rendered as expected.

Switching to .xcframework is not always convenient/possible, so could you please revisit and probably reopen this issue?

[rolfbjarne]

@akravch please create a new issue so that we don't end up confusing potentially two different problems

[akravch]

@akravch please create a new issue so that we don't end up confusing potentially two different problems

Leaving the link for the history: #20061