Re: Key path help for complex binding
Re: Key path help for complex binding
- Subject: Re: Key path help for complex binding
- From: David Hirsch <email@hidden>
- Date: Wed, 02 Dec 2009 09:43:00 -0800
Thanks, Quincey-
That did indeed solve the problem. Are there docs (other than the
official ones, which in this particular area are inscrutable to me)
that discuss this idea of a proxy? I'd like to know more on this
topic, so as to avoid similar problems in the future.
-Dave
On Dec 2, 2009, at 4:17 AM, Quincey Morris wrote:
On Dec 1, 2009, at 16:19, David Hirsch wrote:
The problem is, when I add a new Room to the master rooms array,
and then add that room to the roomCosts array of each Course's
roomConstraint, the table column doesn't get updated, until I tweak
it manually (by adding a new course). It is still bound to the
existing items in the rooms array - if I alter their name, that get
observed and reflected in the table, but adding new ones does not
get observed.
...
@implementation CourseRoomConstraint
- (void) addRoom:(Room *) newRoom {
[roomCosts addObject:[[RoomCost alloc] initWithRoom:newRoom]];
}
It *looks* like the problem is that you're not adding the RoomCost
object KVO-compliantly. Instead of just adding objects to a
NSMutableArray, you should add them to a KVO-compliant mutable array
proxy, something like this:
NSMutableArray* mutableRoomCosts = [self mutableArrayValueForKey:
"roomCosts"];
[mutableRoomCosts addObject: ... etc ];
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