> On Sep 21, 2016, at 8:40 AM, Dave <d...@looktowindward.com> wrote:
> How can I update my UI from a background thread?

You can’t literally do that. But you can schedule code to run on the main 
thread, and update the UI in that code. Use dispatch_async to schedule the 
UI-related code on the main thread/queue. Or if you’re feeling old-school, use 

Even so, it’s a better design to decouple the UI-related code from the worker 
code. For instance you could have the worker code post a notification that the 
UI code can observe. Since the notification will get delivered on the worker 
thread, the UI code’s observer method should use the techniques above to tell 
itself to do the work on the main thread.


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