As we know, at iOS, we could use UIDocumentInteractionController to display the "Open in" menu where a list of third party apps which could handle the document. User could pick one app to open the document at that app.
We are looking for if we could only display a partial list at the "Open In" menu so we could apply security control here. With UIDocumentInteractionController, somehow we didn't find a way to do this. Is this possible at iOS?