linker command failed with exit code 1 解决

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

错误具体信息如下：

Undefined symbols for architecture i386:

  "_OBJC_CLASS_$_VRGCalendarView", referenced from:

      objc-class-ref in InquirePlanViewController.o

ld: symbol(s) not found for architecture i386

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

解决方法：

将相应的出现错误的.m文件，加入到build phases中的compile sources中就可以，位置如下：