I've added an NSInvocationOperation object to process a large file 
asynchronously. Everything mostly works fine, but I am trying to add a way for 
this NSInvocationOperation object to communicate its progress back to the main 
thread (e.g., setting a percent of the file processed).

I have an NSProgressIndicator value bound to a double variable 
"loadingProgressPercent", and I have the operation updating that value with

        self.loadingProgressPercent = percent_read * 100.0;

Again, everything seems to work fine. The one problem is I get the following 
warning at the very end:

        CoreAnimation: warning, deleted thread with uncommitted CATransaction; 
set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.

Is there a common approach for an NSOperation object to communicate its 
progress back to the main thread and have that progress value update an 
NSProgressIndicator?

Thanks,

Todd

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