On 9 Aug 2009, at 16:56, kentoz...@comcast.net wrote:

I'm running an NSInvocationOperation in an NSOperationQueue and set up a listener for the operation's "isFinished" notification. My "observeValueForKeyPath" method is getting called when the operation finishes, but I'm finding that when I try to create a timer inside " observeValueForKeyPath," it never fires. I double checked the "seconds" input to [NSTimer scheduledTimerWithTimeInterval method and it's on;y 5 seconds so it's not like I'm inadvertently using a really long interval. It just never fires.

From the docs for NSOperation:

  Because an operation may execute in any thread, any KVO notifications
  associated with that operation may similarly occur in any thread.

I think the problem, therefore, is that you're trying to schedule your timer on the wrong thread (I guess you're expecting it to be scheduled on your app's
main thread)?

Kind regards,

Alastair.

--
http://alastairs-place.net



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