Re: [NSArrayController] finding object
Re: [NSArrayController] finding object
- Subject: Re: [NSArrayController] finding object
- From: Miguel Sanchez <email@hidden>
- Date: Fri, 11 Nov 2005 10:25:28 -0800
arrays respond to
- (NSArray *)filteredArrayUsingPredicate:(NSPredicate *)predicate
so you can execute a predicate to filter the result, but you'll still
be doing a linear search. If it's efficiency you want, then also
store the objects in a dictionary keyed on the id_number
- Miguel
On Nov 11, 2005, at 2:19 AM, Administrateur internet lutin Ludique
wrote:
Hi,
here is the problem.
I've got a arrayController which manage a collection of objects in
its NSArray content parameter.
All objects are instances from the same class. This class has
several parameters. One of these is "id_number" which stores the
unique id number of the object in the database.
I'd like to get a handle on the object with a specific id_numer in
the collection.
How can I do that ?
For the time being, th only method i foud is to implement a
"response" method in my object class.
- (void) doIHaveThisID: (NSString*) anIdNumber sender: (id)
aSender ;
{ if ( [self valueForKey: @"id_number"] == anIdNumber)
[sender iAmTheOne: self] ; }
And in the controller:
- (void) iAmTheOne: (id) anObject
{ do whatever I whish with anObject now that I found it}
Then by calling
[ [arrayController content] makeObjectsPerformSelector: (sel)
"doIHaveThisID"
withObject: self] ;
But I think this technic is quite heavy. There must be something
more elegant.
Thanks.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden