On 12 Sep 2013, at 09:54, Graham Cox <graham....@bigpond.com> wrote:
> > On 11/09/2013, at 5:33 PM, Etienne Samson <samson.etie...@gmail.com> wrote: > >> I think the best way for what you're trying to do is to subclass >> NSNotificationCenter (or at least provide your own framework-wide singleton >> that quacks like it), wrap -postNotification: with some dictionary-munging >> code that keeps tracks of the last notification send by notification name, >> and have -addObserver:… (you'll have to find the one that actually is the >> designated call, the one all the others expect) check that cache and issue a >> -postNotification: call for that object only (you don't want to notify all >> old objects, only the one that just registered). > > > I'd disagree with this - subclassing something like NSNotificationCenter is a > sledgehammer to crack a nut, and don't forget about the potential side > effects where it is used for lots of other unrelated notifications. > > Why not just have a class method on the sender of the notification that > stores the most recent data sent by an instance of that class? Then when a > new instance of the notification receiver is inited, it can grab the latest > data from the class method to set itself up? No hacks required. I see your point but there were 27 cases like this and I didn't want to add all that code. The only impact on NSNotificationCenter to the rest of the App is that - (void)postNotificationName:(NSString*) theName object:(id) theObject userInfo:(NSDictionary*) theUserInfoDictionary; Which just stores the notification name and the User Info dictionary in a private dictionary. Then just the places that need it call: +(void) repostNotiticationName:(NSString*) theName; +(NSDictionary*) getRememberedNotiticationName:(NSString*) theName; Thinking about it again now, it might have been better to add a - (void)postAndRememberNotificationName:(NSString*) theName object:(id) theObject userInfo:(NSDictionary*) theUserInfoDictionary; Maybe I will revisit at some point. All the Best Dave _______________________________________________ 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
