How to check a UIDocument is in iCloud

Question

What’s the most convenient method to check whether a document is in iCloud or not?

Initially I was going to remove the last path component and compare the item url with the container url (assuming it’s non-nil) but realised that it doesn’t take into account possible subdirectories (e.g folders) if I choose to implement them later on.

Thanks

Answer 1

Use an NSMetadataQuery to search for your documents, then when the query returns the array of NSMetadataItems it has found, examine the item's you're interested in using something like:

BOOL isDownloaded = [[item valueForAttribute:NSMetadataUbiquitousItemDownloadingStatusKey] isEqualToString:NSMetadataUbiquitousItemDownloadingStatusCurrent];
BOOL isUploaded = [[item valueForAttribute:NSMetadataUbiquitousItemIsUploadedKey] boolValue];

If an item is both downloaded and uploaded then it is both in iCloud and exists locally on your device.