On Aug 14, 2015, at 5:23 PM, Carl Hoefs <newsli...@autonomy.caltech.edu> wrote:

> I'm trying to automatically re-queue an NSInvocationOperation to an 
> NSOperationQueue every n seconds, but I can't get it to work.

From the NSOperation class overview:

"An operation object is a single-shot object—that is, it executes its task once 
and cannot be used to execute it again."

Among other reasons, the behavior of -isFinished and -isCancelled dictate this. 
 Those are only allowed to transition from one value to the other at most once.

You'll need to create a new operation each time you want to queue a particular 
invocation.

Regards,
Ken


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