Adding a Native iOS Library to a MAUI Project - objective-c

Question

I develop an app with MAUI (only for iOS), and need to use a library which was written with Xamarin.iOS and it has a static native library (a file)
I could not use the xamarin project, so I just created a new maui class library project and move the code to this project and added a file as a native library
<ItemGroup>
<ObjcBindingNativeLibrary Include="libAreteUart\a" />
</ItemGroup>
And then I added this class library to my maui app project and when I try to build it, I get the following errors
/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk/16.2.1007/targets/Xamarin.Shared.Sdk.targets(3,3):
Error: clang++ exited with code 1:
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_ComboBarcodeApi", referenced from:
objc-class-ref in registrar.o
"_OBJC_CLASS_$_ComboNFCApi", referenced from:
objc-class-ref in registrar.o
"_OBJC_CLASS_$_ComboRFIDApi", referenced from:
objc-class-ref in registrar.o
"_OBJC_CLASS_$_CommonDevice", referenced from:
objc-class-ref in registrar.o
"_OBJC_CLASS_$_CommonReaderInfo", referenced from:
objc-class-ref in registrar.o
"_OBJC_CLASS_$_RcpApi", referenced from:
objc-class-ref in registrar.o
"_OBJC_CLASS_$_SDeviceApi", referenced from:
objc-class-ref in registrar.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation) (TestMauiApp)
As I understand, there is an issue with the Register attribute. Here is my example class
PS: by the way I tried, don't link, only SDK and link all options but got the same error
// Token: 0x02000003 RID: 3
[Register("ComboBarcodeApi", true)]
public class ComboBarcodeApi : SDeviceApi
{
// Token: 0x17000001 RID: 1
// (get) Token: 0x06000059 RID: 89 RVA: 0x0000206E File Offset: 0x0000026E
public override NativeHandle ClassHandle
{
get
{
return ComboBarcodeApi.class_ptr;
}
}
// Token: 0x0600005A RID: 90 RVA: 0x00002078 File Offset: 0x00000278
[CompilerGenerated]
[EditorBrowsable(EditorBrowsableState.Advanced)]
[Export("init")]
public ComboBarcodeApi() : base(NSObjectFlag.Empty)
{
base.IsDirectBinding = (base.GetType().Assembly == Messaging.this_assembly);
if (base.IsDirectBinding)
{
base.InitializeHandle(Messaging.IntPtr_objc_msgSend(base.Handle, Selector.GetHandle("init")), "init");
return;
}
base.InitializeHandle(Messaging.IntPtr_objc_msgSendSuper(base.SuperHandle, Selector.GetHandle("init")), "init");
}
.....
}
I found a similar issue here but no answer or workaround
https://github.com/xamarin/xamarin-macios/issues/17196