Xcode报错解决方案

1、Undefined symbols for architecture x86_64:

详情：

Undefined symbols for architecture x86_64:

  "_OBJC_CLASS_$_LHBCommentViewController", referenced from:

      objc-class-ref in LHBWordViewController.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决方案：把报错的那个类.m加进去