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It seems that my program acts a bit too fast for the system to recognize the changes. How would be the easiest way to make it sleep while waiting for the system?

[[NSRunLoop currentRunLoop] runUntilDate: [NSDate dateWithTimeIntervalSinceNow:1.0]];

Better, why don’t you either register for a notification of whatever changes you initiated (if there is one), or failing that, poll. Yes polling is evil but sometimes there’s no alternative.

Even if you poll, you shouldn’t put it in a while loop. Instead, poll at intervals, using [self performSelector:@selector(poll) withObject:nil afterDelay:some_small_number], or an NSTimer, so that your program can continue to be responsive while you wait.