On Mar 10, 2015, at 11:50 AM, Sean McBride <s...@rogue-research.com> wrote:
> Hi all, > > Can anyone think of a sitation where using removeObserver:forKeyPath: works > correctly, then modernizing the code to use > removeObserver:forKeyPath:context: breaks things? > > Long story: I have a custom NSView subclass that exposes a custom binding. > In bind: it does addObserver:forKeyPath:options:context:. In unbind: it does > removeObserver:forKeyPath:. If I update unbind: to use the 'context' version > it breaks. > > Specifically, if I have several of these views onscreen (all bound to the > same NSObjectController) then remove all but one of the views from the view > hierarchy, the remaining one no longer receives any KVO notifications. I've > put logs everywhere, and subclassed NSObjectController and implemented > add&removeObserver methods to log and call super. All the log output is the > same in the working & broken cases except the deliberate difference between > using removeObserver: with or without the context. I am surprised to see > this backtrace however: > > -[MyObjectController removeObserver:forKeyPath:] > -[NSObject(NSKeyValueObserverRegistration) > removeObserver:forKeyPath:context:] () > -[NSController removeObserver:forKeyPath:context:] () > -[MyObjectController removeObserver:forKeyPath:context:] > -[MyView unbind:] > ... > > Odd that NSObjectController removeObserver:forKeyPath:context: calls > removeObserver:forKeyPath:, no? > > Any clues would help... :) Have you checked observationInfo at each point to ensure that observation is being added/removed exactly as you expect? 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
