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
- (void) addObserver:<#(NSObject *)observer#> forKeyPath:<#(NSString
*)keyPath#> options:<#(NSKeyValueObservingOptions)options#>
context:<#(void *)context#>
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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