unity3d导出xcode项目使用afnetworking 3框架导致_kUTTagClassMIMEType 问题解决方案
http://blog.csdn.net/huayu_huayu/article/details/51781953(参考链接)Undefinedsymbolsforarchitecturearmv7:"_kUTTagClassMIMEType",referencedfrom:-[AFStreamingMultipartFormDataappendPartWithFileURL:name:error