NSMetadataQuery not working

Question

I am trying to use iCloud in my app. In the simulator, I notice that it takes a short amount of time after launch for new files in iCloud to be added to the ubiquity container. So to refresh my UI to reflect these changes, I set up an NSMetadataQuery as shown:

_query = [[NSMetadataQuery alloc] init];
_query.searchScopes = @[ubiquityContainer];
_query.predicate = [NSPredicate predicateWithFormat:@"%K == '*'", NSMetadataItemFSNameKey];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(refreshFiles) name:NSMetadataQueryDidUpdateNotification object:nil];
[_query startQuery];

refreshFiles is never called...

My app saves its files directly in ubiquityContainer (an NSURL) - it doesn't create any subdirectories...

What am I doing wrong?

Is `query` a local variable or an instance variable? If it's a local then the problem is that `query` will be deallocated when it goes out of scope. — rmaddy, Mar 16 '14 at 23:41
But you are aren't using the property, you appear to be directly using the ivar. How is the property declared? Show the `@property` line. — rmaddy, Mar 16 '14 at 23:44
"@property (strong, nonatomic) NSMetadataQuery *query;" I also use "@synthesize" — Macro206, Mar 16 '14 at 23:45
I've now changed it to an ivar, but that doesn't seem to change anything — Macro206, Mar 16 '14 at 23:48
Try changing the predicate to `%K like '*'`. You need to use `like` with wildcards. — rmaddy, Mar 16 '14 at 23:50
I tried, and it still doesn't work. But thanks for your help — Macro206, Mar 17 '14 at 07:40

score 0 · Answer 1 · answered Mar 17 '14 at 23:14

0

I found out what the issue was! I needed to use NSMetadataQueryUbiquitousDataScope as the search scope. That fixed the problem!

answered Mar 17 '14 at 23:14

Macro206

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NSMetadataQuery not working

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