iOS 報錯 Undefined symbols for architecture x86_64:解決方法

一,報錯詳情 Undefined symbols for architecture x86_64: 「OBJC_CLASS$_Person」, referenced from: OBJC_CLASS$_Dog in Dog.o objc-class-ref in ViewController.o 「OBJC_METACLASS$_Person」, referenced from: OBJC_MET
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