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：
