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Mon, 15 Jun 2015 08:14:30 -0700 (MST)
OK, the immediate answer to my question is that dispatch_async runs in the
background and additional code needs to be added to inform the main thread
of the results of the calc. If I change dispatch_async to dispatch_sync the
code executes properly.
If anyone would care to educate me better on GCD or knows a good tutorial
(other than MAC devs stuff) I'd be grateful.
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