为xamarin ios构建firebase ios sdk绑定时出现链接器错误

Question

[assembly: LinkWith("Firebase.a", LinkTarget.Simulator | LinkTarget.ArmV7, ForceLoad = true, Frameworks = "CFNetwork Security SystemConfiguration", LinkerFlags = "-ObjC -fobjc-arc -licucore -lc++")]

error MT5211: Native linking failed, undefined Objective-C class: _OBJC_CLASS_$_FirebaseHandle. If '_OBJC_CLASS_$_FirebaseHandle' is a protocol from a third-party binding, please check that it has the [Protocol] attribute in its api definition file, otherwise verify that all the necessary frameworks have been referenced and native libraries are properly linked in.

知道为什么会这样吗？

[更新]

通过进一步分析，我发现firebase sdk的一个头文件有如下条目

typedef NSUInteger FirebaseHandle;

[BaseType(typeof(NSObject))]
interface FirebaseHandle
{
}

但我还是知道错误

Answer 1

尝试添加

SmartLink=true

到x.linkwith.cs文件

[BaseType(typeof(NSObject))]
interface FirebaseHandle
{
}