I have an app which is something of a generic file manager. I would like the “Open in…” functionality present in apps using QLPreviewController, UIDocumentInteractionController, etc to be able to send my app any filetype.
I have created a document type but whether the “Types” is set to ” * “, “public. * “, or similar combinations I can’t get the app to display for non-specific cases (it does work if I change the UTI to com.adobe.pdf, for example).
On Mac OS X one can set an app to be a generic viewer of all file types – is this not possible on iOS?
EDIT
Going through the docs, I found there are only a handful of primitive UTI types, from which all others inherit
public.item
public.content
public.database
public.calendar-event
public.message
public.contact
public.archive
public.url-name
public.executable
com.apple.resolvable
Of these, many are clearly never going to be instances of files.
I may have been overly ambitious trying to create a wildcard test: I tried public.item and it worked on a pdf file from mail. Since the docs state that public.item is the “Base type for the physical hierarchy.”, that could mean this is the wildcard, ie ” public.item = * “
Worst case scenario, I could add item, content, database, and archive and hope for the best. Best case scenario, item covers everything.
public.item works for every type I’ve tried so far.