AFNetworking报错"_UTTypeCopyPreferredTagWithClass", referenced from: _AFContentTypeForPathExtens
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问题:
最近在原来项目中用MKNetworkKit 实现网络请求,想为了使应用符合AppStore的要求,用AFNetworking3.0+来满足ipv6。导入AFNetworking 和UIKit+AFNetworking 两个文件的时候5处地方报错:
Undefined symbols for architecture x86_64:
"_UTTypeCopyPreferredTagWithClass", referenced from:
_AFContentTypeForPathExtension in AFURLRequestSerialization.o
"_UTTypeCreatePreferredIdentifierForTag", referenced from:
_AFContentTypeForPathExtension in AFURLRequestSerialization.o
"_kUTTagClassFilenameExtension", referenced from:
_AFContentTypeForPathExtension in AFURLRequestSerialization.o
"_kUTTagClassMIMEType", referenced from:
_AFContentTypeForPathExtension in AFURLRequestSerialization.o
ld: symbol(s) not found for architecture x86_64
知道是确少.framework 框架。就不知道是哪个.framework。最后找到是未添加 MobileCoreServices.framework(此框架定义统一类型标识符 (UTIs)使用的底层类型)
解决:Build Phase ->Link Binary With Libraries()下添加 MobileCoreServices.framework。添加成功后运行程序成功。
如果在新建的工程中直接导入AFNetworking 和UIKit+AFNetworking 文件夹是不会报错,即使最低支持版本7.0,Bitcode值为NO,不添加 MobileCoreServices.framework 都不会报错。这和工程的配置有关。
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