报找不到_objc_opt_class
Undefined symbols for architecture x86_64:
"_objc_opt_class", referenced from:
-[NSObject superclass] in NSObject.o
-[NSObject isMemberOfClass:] in NSObject.o
-[NSObject isKindOfClass:] in NSObject.o
+[NSObject isAncestorOfObject:] in NSObject.o
-[NSObject respondsToSelector:] in NSObject.o
-[NSObject conformsToProtocol:] in NSObject.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
简单快速的方法：General -> Deployment Target 改为10.14.
Pass!
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