I think I resolved it… my data object's members were all declared using
@property(assign). I changed those all to @property(retain), and it works now.
Thanks,
Howard
On Oct 15, 2014, at 1:42 PM, Howard Moon <[email protected]> wrote:
> Hi,
>
> I'm working on my first ARC-enabled app, but am having a problem with
> how to keep my delegate's member data alive.
>
> At startup (in the delegate's applicationDidFinishLaunching: function),
> my delegate initializes a data object (a member of the delegate) containing
> some NSString members. Those strings are populated via a call to a helper
> class that is also a member of the delegate. That helper class call
> initiates an asynchronous set of actions (HTTP), then returns immediately
> back to the delegate. After returning from that call, the delegate's
> applicationDidFinishLaunching: function simply drops out the bottom.
>
> When the helper class finishes populating the data from the
> asynchronous HTTP call, it responds with a callback into the delegate. The
> delegate's callback function responds by showing the main window and
> populating some text fields and buttons according to the strings in the data
> object. The callback function then drops out the bottom. The dialog shows
> the correct information, meaning that at THAT point in time, the data object
> was still valid.
>
> My problem comes later, when the user clicks on one of the buttons,
> which calls an action in the delegate. At this point, I try to extract one
> of the strings from the data object (to launch a browser with the given URL
> string), and it gives me an access violation. Apparently, my data object has
> been deleted. That is strange, since it is a member of the delegate.
>
> I was under the impression that my design was correct, in that member
> objects of the delegate should be initialized in the
> applicationDidFinishLoading: function, right? So why does the object get
> deleted while my delegate still exists? More importantly, how do I keep that
> member data object alive so that my delegate's actions can access it?
>
> Thanks,
> Howard
>
>
>
>
>
>
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