I think you also need to register for the drag types via
-registerForDraggedTypes. I pass in a mix of UTIs and legacy pboard types and
it seems to work. For example:
[tableView registerForDraggedTypes:[NSArray arrayWithObjects:(NSString
*)kUTTypeURL, NSPasteboardTypeString, @"ABPeopleUIDsPboardType", nil]];
In your -validateDrop method you can check the pasteboard for URLs that conform
to local image files, for example.
The new NSPasteboard routines are poorly documented and badly represented in
the sample code. Good luck figuring them out.
> Message: 5
> Date: Sun, 04 Mar 2012 07:01:30 -0800
> From: Jerry Krinock <je...@ieee.org>
> To: Cocoa-Dev List <cocoa-dev@lists.apple.com>
> Subject: Re: setAllowedFileTypes: (or similar) for NSPasteboard
> Message-ID: <7c036771-17a3-44da-85ff-ff04dad10...@ieee.org>
> Content-Type: text/plain; charset=utf-8
>
>
> On 2012 Mar 04, at 01:28, Rick C. wrote:
>
>> I want to make a UTI array to limit what can be dragged onto my TableView.
>
> Implement -tableView:validateDrop:proposedRow:proposedDropOperation: and
> return NSDragOperationNone if the [info draggingPasteboard] contains stuff
> you don't want.
>
>> Sorry if I'm missing the obvious here
>
> Drag and drop is not obvious. See: Table View Programming Guide ▸ Using Drag
> and Drop in Tables.
>
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