On 9 Dec 2015, at 09:49, Rick Mann <rm...@latencyzero.com> wrote:

> The docs say "If you call the invalidateAndCancel method, the session calls 
> this delegate method immediately." So, it's no different.

IMO the docs are misleading here.  There's two things to keep in mind:

* If you start a task in a session, it will always run to completion, meaning 
that you'll eventually get a -URLSession:task:didCompleteWithError: callback.

* -URLSession:didBecomeInvalidWithError: is always the last delegate callback 
you receive for a given session.

These two facts mean that, if you -invalidateAndCancel a session with multiple 
outstanding tasks, the tasks will all complete (with NSURLErrorDomain / 
NSURLErrorCancelled) and then you'll get the didBecomeInvalidWithError callback.

If this wasn't clearly explained by the documentation, please do file a bug 
about that.

<https://developer.apple.com/bug-reporting/>

Share and Enjoy
--
Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware



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