Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_NXTabBarController", referenced from:
objc-class-ref in NXStartPageViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
也可能是需要把相应的.m文件删除掉
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