本帖最后由 执笔梦 于 2015-4-19 09:17 编辑
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_Book", referenced from:
objc-class-ref in Person-87f000.o
ld: 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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