I am coding a single window, multiview, app, and as what I think is a
recommended design pattern I only load the views controllers (and
therefore their views) from their nibs as they are required, and then
I retain them in the main window controller so they do not have to be
loaded again each time the user switches from one view to another that
has been previously shown.
As part of my application, I also need the views to react to changes
on several conditions of the whole application, an thus for each view
I set up observers to the relevant keyPaths of the application
delegate by using:
[[NSApp delegate] addObserver:self forKeyPath:@"myKey"
options:NSKeyValueObservingOptionNew context:nil] ;
in the view controller awakeFromNib method and
[[NSApp delegate] removeObserver:self forKeyPath:@"myKey"] ;
in the view controller dealloc method
So far so good.
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)?
Thanks for any comment.
Joan Lluch
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