Bindings question...
Bindings question...
- Subject: Bindings question...
- From: Jim Majure <email@hidden>
- Date: Sat, 12 Dec 2009 13:03:02 -0600
I have a question regarding bindings: when I bind the value of a
TableColumn to a controller, I specify the key path as something like
this: @"arrangedObjects.name". So each row of the table, displays the
"name" field from an object in the "arrangedObjects" property of the
controller. In the IB it's actually broken into the controller key,
"arrangedObjects", and the keypath, "name", though i don't see how
this impacts the bind:toObject:withKeyPath:options: method.
When I modify a value in a view, I send the setValue:forKey: message
to the controller. What I don't understand is how the TableColumn is
specifying the particular instance in the "arrangedObjects" array that
was changed. If I just say this:
[controller setValue:@"new value" forKey:@"arrangedObjects.name"]
the specific instance is not specified. What is actually happening
under the covers here?
One possibility I can think of is that it uses the collection accessor
pattern (objectIn<Key>AtIndex:) to retrieve the object, then use the
setValue:forKey: on the individual object.
I'm trying to use bindings to link a custom view to NSManagedObject
instances. The view uses cells to represent each element of the
controller collection, in a fashion analogous to TableColumn.
Thanks for any help.
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