Undefined symbols for architecture armv7: "_OBJC_CLASS_$XXController", referenced from: objc-class-ref in XXViewController.o ld: symbol(s) not found for architecture armv7

今天碰到的这个错误：

Undefined symbols for architecture armv7:
  "_OBJC_CLASS_$_XXController", referenced from:
  objc-class-ref in XXViewController.o
ld: symbol(s) not found for architecture armv7

3.37.22.png

我的解决方式： 现在在同一个工程分了多个版本导致的，切换版本时对应控制器的target membership没有设置。如图选择就可以了：

3.33.59.png