Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_QNUploadManager", referenced from:
objc-class-ref in InpidualCenterController.old: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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This is probably because the sdk you downloaded does not include the compiled version of the simulator.
x86_64 is the kernel framework of the computer, that is, the simulator. If you replace it with a real machine, you probably won't get an error.
Please refer to the following blog, I hope it will be helpful to you
http://blog.csdn.net/sunyuanyang625/article/details/17097085
The error is not here, there may be two problems, please see the screenshots for details
Refer to this~
http://www.knowsky.com/884737.html