xcode工程报错：opencv2/core/core.hpp file not found with include, use "quotes" instead

mac xcode工程，新增的opencv头文件报错：

with <opencv2/core/core.hpp> file not found with <angled> include, use "quotes" instead.

 

解决方法：https://stackoverflow.com/questions/17465902/use-of-external-c-headers-in-objective-c

路径设置好后，还要将：Always Search User Paths设置为Yes：