objective-c - 为何iOS项目中使用extern就会出现"XXX", referenced from:... 的编译错误?

Question

说明: 我再项目中集成一个Unity3D的功能.之前几次集成都没问题, 这次集成突然出现这个问题.

都是 "方法名",referenced from : ...... 这些方法名在项目中都是有extern 申明的.请问各位大神应该如何解决?

Answer 1

Have you solved this problem? I also encountered this problem and I don’t know what to do