On 22 Sep 2016, at 04:00, Doug Hill <[email protected]> wrote: > As to the context type, I would be interested to know of cases where the > observer doesn't have control over the context.
As your quote says: > "Contexts chosen in a similar manner in the super- or subclass will be > unlikely to overlap." It is to insulate code inherited from a superclass that observes the same property as code in the superclass. By using a unique context as an additional identifier for the subscription, the subclass can't accidentally unsubscribe the base class that still wants to stay subscribed. Cheers, -- Uli Kusterer "The Witnesses of TeachText are everywhere..." http://www.zathras.de _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
