SBFolderController is the superclass of SBRootFolderController. You can use this class to create a new instance of SBFolderController for any SBFolder (you could also use another SBFolderController, which is relevant for folders within folders). This is useful if you need a SBFolderView.
iOS 8
// Get an instance of SBFolderController
SBIconController *iconController = [%c(SBIconController) sharedInstance];
SBRootFolderController *rootFolderController = [iconController _rootFolderController];
SBFolder *folder = [iconView.icon folder];
Class controllerClass = [iconController controllerClassForFolder:folder];
SBFolderController *innerFolder = [[[controllerClass alloc] initWithFolder:folder orientation:[iconController orientation] viewMap:[rootFolderController _viewMap]] autorelease];
//Tell rootFolderController we have an innerFolderController
[rootFolderController setInnerFolderController:innerFolder];
//Folder view retrieved with:
SBFolderView *view = [innerFolder contentView];
//To close folder
[rootFolderController _setInnerFolderOpen:NO animated:NO completion:nil];