Undefined symbols for architecture x86_64:code
"_OBJC_CLASS_$_UserDetailInfoView", referenced from:ip
objc-class-ref in ViewController.oget
ld: symbol(s) not found for architecture x86_64it
clang: error: linker command failed with exit code 1 (use -v to see invocation)io
出现这种错误,打开UserDetailInfoView.m文件,点击右边的Target Membership 勾选上Test就好了class