Swift Firebase："_GSDK_NSClassFromString"，引用于：

Question

我第一次尝试我们的防火墙。我选择手动安装SDK，因为Pod安装需要花费很长时间。

我一步一步地遵循方向，当我试图运行该项目时，我得到了以下错误：

Undefined symbols for architecture x86_64:
  "_GSDK_NSClassFromString", referenced from:
      -[GSDK_GTMSessionFetcher initWithRequest:configuration:] in GoogleNetworkingUtilities(GTMSessionFetcher.o)
      ___45+[GSDK_GTMSessionFetcher fetcherUserDefaults]_block_invoke in GoogleNetworkingUtilities(GTMSessionFetcher.o)
      -[GSDK_GTMMIMEDocument generateInputStream:length:boundary:] in GoogleNetworkingUtilities(GTMMIMEDocument.o)
      -[GSDK_GTMSessionFetcher(GTMSessionFetcherLogging) loggedInputStreamForInputStream:] in GoogleNetworkingUtilities(GTMSessionFetcherLogging.o)
      -[GSDK_GTMSessionFetcher(GTMSessionFetcherLogging) loggedStreamProviderForStreamProvider:] in GoogleNetworkingUtilities(GTMSessionFetcherLogging.o)
  "_OBJC_CLASS_$_FIRApp", referenced from:
      objc-class-ref in FirebaseAuth(FIRAuth_70be5a6d79de0ee5c6b8ffda807589e3.o)
  "_OBJC_CLASS_$_FIRAppAssociationRegistration", referenced from:
      objc-class-ref in FirebaseAuth(FIRAuth_70be5a6d79de0ee5c6b8ffda807589e3.o)
  "_kFIRAppDeleteNotification", referenced from:
      ___15+[FIRAuth load]_block_invoke in FirebaseAuth(FIRAuth_70be5a6d79de0ee5c6b8ffda807589e3.o)
  "_kFIRAppNameKey", referenced from:
      ___15+[FIRAuth load]_block_invoke_2 in FirebaseAuth(FIRAuth_70be5a6d79de0ee5c6b8ffda807589e3.o)
      ___15+[FIRAuth load]_block_invoke_4 in FirebaseAuth(FIRAuth_70be5a6d79de0ee5c6b8ffda807589e3.o)
  "_kFIRAppReadyToConfigureSDKNotification", referenced from:
      ___15+[FIRAuth load]_block_invoke in FirebaseAuth(FIRAuth_70be5a6d79de0ee5c6b8ffda807589e3.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

有人知道为什么吗？

Answer 1

我不能肯定它不是像带宽这样的其他东西，但是尝试下面的内容，看看它在新的设置/安装上是否运行得更快：

pod repo remove master
pod setup
pod install

Answer 2

请检查“其他链接器设置”中的-ObjC链接器标志，以强制加载类别。没有这一点，有时只有类别的文件无法正确链接。