【Unity iOS打包】Undefined symbols: _OBJC_CLASS_$_GULUserDefaults, referenced from: ***

 Unity导出XCode工程，在XCode内运行报错

报错：

ld: Undefined symbols:
  _OBJC_CLASS_$_GULUserDefaults, referenced from:
       in FirebaseInstallations[18](FIRInstallationsStore.o)
clang: error: linker command failed with exit code 1 (use -v to see invocation)

 

解决：

在 Build Settings -> Search Paths里，把指定路径移到最前面