title: Xcode cannot find header files when files added in folder reference mode
body: <p>I am trying to add many Objective-C files to my Swift project with folder reference mode that means when I drag and drop my files into project I am selecting "Create Folder Reference".</p>
  
  <p>This is because all of my obj-c files use <code>#include "/folder/folder/folder/"</code> for example. These files are generated with <a href="https://developers.google.com/j2objc/" rel="nofollow noreferrer">j2objc</a> project.</p>
  
  <p>Now my problem is when I want to <code>#import</code> or <code>#include</code> some <code>.h</code> of these files in <code>myproject-Bridging-Header.h</code> Xcode can't find the header files.
  I use <code>#import "/folder/folder/folder/"</code> like generated files but no chance.</p>
  
  <p>I add <code>$(PROJECT_DIR)/</code> in build settings - search header paths but it does need to write path completely like <code>$(PROJECT_DIR)/folder/folder/folder/</code>.
  Is there any way to set main folder and Xcode find subfolders ? Or do I need to write every path separately ?</p>