> On Sep 21, 2016, at 7:00 PM, Doug Hill <cocoa...@breaqz.com> wrote: > > As to the context type, I would be interested to know of cases where the > observer doesn't have control over the context. My understanding is that the > context is something that the observer sets itself when calling addObserver, > and it is passed back to itself in the above method call. So the observer > should know what kind of entity the context is, and can determine the best > way to compare this value.
Subclasses or superclasses can register observers, so it’s possible for your observer method to get called for observations that you didn’t create. (The subclass case is less likely, because the subclass’s observer method should be handling that call and not calling super, but it’s good defensive coding practice to not rely 100% on that.) —Jens _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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 arch...@mail-archive.com
