When I instantiate and run an NSMetadataQuery on the main thread I can
register for, and receive its notifications, but when I try to run the
same code on a separate thread it seems like the notifications are not
being delivered. I assumed that NSMetadataQuery was still delivering
its notifications on the main thread so I tried to set the window
controller as an observer for the query notifications, like so:
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self
selector:@selector(sendNotification:)
name:@"NSMetadataQueryDidFinishGatheringNotification"
object:nil];
[myThread start];
In the sendNotification: method I send the notification to the other
thread using performSelector: onThread: however sendNotification: is
never even called. Either the notifications are not, in fact being
sent to the main thread or I'm doing something else wrong. There is
probably something basic about threads or notifications that I don't
understand but I have run out of ideas about what to try next.
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