Hi,
That works now, Thanks Very Much!!!
Josh.
________________________________
From: Volker in Lists <volker_li...@ecoobs.de>
To: Joshua Garnham <joshua.garn...@yahoo.co.uk>
Cc: cocoa-dev@lists.apple.com
Sent: Wednesday, 7 October, 2009 18:04:59
Subject: Re: Triggering a Method when a Core Data Property is Altered.
Hi,
awakeFromFetch is only called when the object is loaded from the persistent
store (=fetched). So all newly inserted objects are not observed.
this might be one reason for not getting triggered for rows 2/3 if they were
not fetched but created. Otherwise I have no idea why it doesn't work yet-
Volker
Am 07.10.2009 um 18:54 schrieb Joshua Garnham:
Hi,
>
>Ok, I have changed it to awakeFromInsert: and have removed the observer in the
>NSManagedObjects dealloc: method.
>And have already fixed the performSelector: problem.
>
>So the NSManagedObject sub-class looks like …
>
>- (void) awakeFromFetch {
> [self addObserver:[NSApp delegate] forKeyPath:@"name"
> options:NSKeyValueObservingOptionNew context:nil];
>}
>
>- (void)dealloc {
> [self removeObserver:[NSApp delegate] forKeyPath:@"name"];
> [super dealloc];
>}
>
>
>… and the App Delegate …
>
>- (void)observeValueForKeyPath:(NSString *)keyPath
> ofObject:(id)object
> change:(NSDictionary *)change
> context:(void *)context {
> [self performSelector:@selector(doSomthing:)];
>}
>
>It builds without any warnings but it only half works.
>What happens is as follows …
>In my table view I have added three rows, each have text fields bound to the
>'name' property.
>The method is triggere when I change the text for the first row however it is
>not triggered when I change the text for the
>other rows. Do you have any idea why this is?
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