iOS -Undefined symbols for archi

我遇见的错误（拷贝）：
Undefined symbols for architecture arm64:
"OBJC_CLASS$_CameraView", referenced from:
objc-class-ref in CameraViewController.o
(maybe you meant: OBJC_CLASS$_CameraViewController)
"OBJC_CLASS$_CapatureInfo", referenced from:
objc-class-ref in HomeViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决方法：
http://stackoverflow.com/questions/19213782/undefined-symbols-for-architecture-arm64

不得不说，大神就是大神！！！