ios - Apple Mach-O 链接器错误 (5)

Question

每当我尝试构建我的项目（它同时具有IFUnicodeURL和JSON）时，我都会不断收到这 5 个 Mach-O 错误。

架构 armv7 的未定义符号：

  "_kUTTagClassMIMEType", referenced from:
      -[NSString(NPMimeType) mimeType] in NSString+NPMimeType.o
  "_UTTypeCopyPreferredTagWithClass", referenced from:
      -[NSString(NPMimeType) mimeType] in NSString+NPMimeType.o
  "_UTTypeCreatePreferredIdentifierForTag", referenced from:
      -[NSString(NPMimeType) mimeType] in NSString+NPMimeType.o
  "_kUTTagClassFilenameExtension", referenced from:
      -[NSString(NPMimeType) mimeType] in NSString+NPMimeType.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我不知道如何阅读这些东西，这让我发疯。有人可以帮我吗？任何帮助，将不胜感激。提前致谢。