| path | The physical path to the folder on the filesystem. |
| projectPath | The project path to the folder. |
| sourceTree | The source tree the path is relative to. By default it's PBXSourceTree.Source. The PBXSourceTree.Group tree is not supported. |
string The GUID of the added folder reference. You can use it later, for example, to add the file for building to targets.
Adds a new folder reference to the list of known files.
The group structure is automatically created to correspond to the project path. To add the folder reference to the list of files to build, pass the returned value to AddFileToBuild.