inside awakeFromFetch/FromInsert of my observed class in order to get
each notification.
It works very well.
Again thank you
Il giorno 27/apr/08, alle ore 06:44, Ben Lachman ha scritto:
I'm not completely clear on what you're wanting, but you might try
this:
•Have your controller observe the managed object context's
NSManagedObjectContextObjectsDidChangeNotification, the userinfo of
this note contains the key NSInsertedObjectsKey and
NSDeletedObjectsKey which should let you know which objects to start/
stop observing. Make sure you read the docs about this note and
when it's sent, etc.
•In your controller call addObserver:forKeyPath:... on each of the
newly added objects that you're interested in.
In general though it is easier to bind to stuff through a pre-built
controller that is in entity mode than observe all the objects
yourself. KVO is definitely the way to go though since it gives you
change info.
Hello,
I need to observe from a controller class when a particular
attribute of a NSManagedObject in my persistent store is changed.
I've tried with:
- (BOOL)validateValue:(id *)value forKey:(NSString *)key error:
(NSError **)error
in my class. Unfortunatly I need to keep the old value in order to
make a comparison between it and the new value (id* value) and this
method does not allow it.
So I've tried using
but the only way to keep changes of all objects is to put this
method into the init of my class (inside a subclassed method -
(id)initWithEntity:(NSEntityDescription *)entity
insertIntoManagedObjectContext:(NSManagedObjectContext *)context).
Bleah, it's not a great solution right?
Anyone can point to me to the right way?
Thanks in advanced
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