Re: rerunning an NSOperation object
Re: rerunning an NSOperation object
- Subject: Re: rerunning an NSOperation object
- From: Robert Martin <email@hidden>
- Date: Sat, 05 Mar 2011 22:57:34 -0500
From the docs for NSOperation:
... "An operation object is a single-shot object—that is, it executes its task once and cannot be used to execute it again."
On Mar 5, 2011, at 10:33 PM, Shane wrote:
> I have an NSOperation object that has been placed in an
> NSOperationQueue. I then execute that NSOperation and all works
> normal.
>
> What I'd like to do is then run that task again, however, when I do
> run it I get the following error when trying to add that object to the
> queue again.
>
> Caught NSInvalidArgumentException*** -[NSOperationQueue
> addOperation:]: operation is finished and cannot be enqueued
>
> I then see that the "NSOperationQueue Class Reference" says this about
> addOperation: ...
> "Similarly, this method throws an NSInvalidArgumentException exception
> if the operation is currently executing or has already finished
> executing."
>
> So it has finished executing, and I'd like to know how to execute it
> again but w/o having to build a new object. Is there a way to rerun an
> NSOperation object, or should I do something else besides call
> addOperation: again?
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