On May 9, 2012, at 18:48 , Koen van der Drift wrote:
> Hmmm, an indexset just gives me an index, how do I get the object from it
> that it belongs to? I think I still need to be able to access the
> NSArrayController (that feeds the NSTableView) for that?
The array controller is also bound to some indexed property of your app
delegate, "myThings". For example, you might have (in the app delegate .h file):
@property (readonly) NSArray* myThings;
Then to get the selected objects:
[appDelegate.myThings objectsAtIndexes: appDelegate.selectionIndexes];
or to get just "the" selected object:
appDelegate.selectionIndexes.count ? [appDelegate.myThings
objectAtIndex: appDelegate.selectionIndexes.firstIndex] : nil;
Note that what you're doing here is querying the MVC "M" (model) for objects.
Getting the selected objects from the array controller is (IMO) querying the
"V" -- because I think of array controllers as effectively part of the view
complex: they are, after all, typically part of the NIB that defines the view
components. Technically, they're controllers (mediating controllers, rather
than coordinating controllers), but my attitude is that they're [semi-]private
to a sub-MVC system within the main MVC "V". Others might not choose to think
of them this way.
Anyway, my point is that by querying the "M" rather than the "V", your view
controller doesn't have dependencies on "V" implementation details. It doesn't
need to know that there is a table view or an array controller. That's
*usually* a cleaner design.
(Sometimes it *is* easiest to query the array controller directly -- for
example, if you need "selectedObjects" or "arrangedObjects" in the sorted
order.)
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