On Sat, 24 Jan 2009 09:07:59 +0000, "jonat...@mugginsoft.com" <jonat...@mugginsoft.com> said: > >On 24 Jan 2009, at 02:43, David LeBer wrote: > >> This may be a stupid question, but I've had reason to wonder a >> number of times. >> >> If I have an NSArrayController in a nib, bound to a MOC, configured >> with an Entity name and set to prepare content: >> >> Is there a way to be notified when it has finished loading and >> arranging it's objects? >> >Hi David > >Adding an observer on the controller's arrangedObjects property should >do the trick. > >[arrayController addObserver:self forKeyPath:@"arrangedObjects" >options:0 context:(void *)&ControllerContentContext]; > >In a persistent document based app, for example, the controller's MO >content is not yet available in - (void)windowControllerDidLoadNib: >(NSWindowController *)windowController. >Adding the observer means you can set up any dependent code when the >binding/core data machinery has finished doing its thing.
Is that really true? I'm not saying you're wrong; I'm really asking. When I posed the same question a couple of years back, I was told that the solution is, do *not* "set to prepare content"; instead, load the data yourself by calling fetchWithRequest: [arrayController fetchWithRequest:nil merge:NO error:&error]; When that call returns, the data is ready. I just now tried adding addObserver: to the mix, just as an experiment, and logging reveals that I get two corresponding calls to observeValueForKeyPath:, *before* fetchWithRequest: has returned. The two calls are quite far apart (half a second or so). Well, I sure wouldn't want to run my "dependent code" half a second too early. So I'm not convinced that this approach is entirely safe, at least not without some further modification... m. -- matt neuburg, phd = m...@tidbits.com, <http://www.tidbits.com/matt/> A fool + a tool + an autorelease pool = cool! One of the 2007 MacTech Top 25: <http://tinyurl.com/2rh4pf> AppleScript: the Definitive Guide - Second Edition! <http://www.amazon.com/gp/product/0596102119> _______________________________________________ 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 arch...@mail-archive.com
