7/17/08 8:59 AM, also sprach [EMAIL PROTECTED]: > However, the way I am doing it makes me wonder where the best place > should be for adding and removing the observers. What I am currently > doing is adding the observers in the awakeFromNib methods of each > viewController, and removing them in the dealloc method of the same > controller. I think that adding the observers in awakeFromNib methods > is fine, but the fact that I retain the view controllers implies that > such controllers are still observing the application delegate even if > they are not currently showing. Is this a good coding/design pattern?. > > Furthermore, if I eventually switch to Garbage Collection in the > future, those observers will not ever be removed. Or worse, in case I > decided not to keep a reference in my window controller, and the GC > eventually claims an unused view controller, then what will happen to > the observers. > > Would someone bring a light to this.? Basically what i am asking is, > where is the recommended place to add and to remove observers set up > in views (or view controllers)?
I don't think it matters when you *start* observing, as long the the observed objects are guaranteed to exist. awakeFromNib is a perfect place if you expect the observation to last the lifetime of the nib objects. I will say that removing observation in dealloc is a dangerous endeavor. It works if you can guarantee that the observer will be deallocated *before* the observed. This guarantee is difficult if not impossible in a nib-loaded situation, AFAIK. I believe that the bindings mechanism, however, has ways to deal with these issues in a nib-loaded situation (and generally as well). That might be an avenue to pursue. HTH, Keary Suska Esoteritech, Inc. "Demystifying technology for your home or business" _______________________________________________ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
