Swift NSURL getResourceValue as NSURLThumbnailDictionaryKey returns nil -

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i'm trying thumbnail of several files , should return nsdictionary yet keeps returning nil. instance, works:

try aurl.getresourcevalue(&thumbnails, forkey:nsurlnamekey)             if let thumbnail = thumbnails as? nsstring             {                 print(thumbnail)             }

but doesn't (which i'm trying do):

try aurl.getresourcevalue(&thumbnails, forkey:nsurlthumbnaildictionarykey)             if let thumbnail = thumbnails as? nsdictionary//dictionary<string, nsimage>//doesn't work either             {                 print(thumbnail)             }

anybody have idea problem here? in advance.


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