The simplest way is to create action methods in your controller class,
along with ivars for the array controllers you need to access,
something like this in the header:
@interface MyController : NSObject {
IBOutlet NSArrayController *masterController;
IBOutlet NSArrayController *detailController;
}
- (IBAction)calculate:(id)sender;
@end
Then hook things up in IB, and then implement the calculate: method,
using ivars to grab and set the values you need. I'd offer an example,
but I'm writing on an iPhone and this has taken enough time already!
;)
// jack
// http://nuthole.com
// http://learncocoa.org
On Thursday, July 22, 2010, Amy Gibbs <h...@willowtreecrafts.co.uk> wrote:
> Hi,
>
> Apologies in advance for being stupid!
>
> I've got an app I'm trying to create, using Core Data, I created the data
> model, and Dragged some of the interface into place in the nib.
>
> I've almost got the bindings sorted so it's got Array controllers for all the
> entities, and it's pretty much displaying everything correctly.
>
> Some things I want to do though need to be actually coded, but how do I
> reference the Arrays/Array controllers in the code? Do I need to declare
> them? They aren't at the moment that I can see, but somehow it's using them.
> All the tutorials I find either cover everything in code (kind of Pre-Core
> Data) or do everything with bindings.
>
> For example, I've got an Entity called Product, with 3 properties, UOMcost,
> purchaseUOM and cost. I want cost to = UOMcost/purchaseUOM. I can't set this
> up in the datamodel, so I need to calculate it. In my interface I've got a
> table with all the products, and text boxes that show the data for the
> selected product ( master/details display). I've added a 'calculate' button,
> so now I just need to take the 2 properties from the selected product, do the
> maths, and set the cost property with the result.
>
> If anyone could show me how to do this I'd be extremely grateful, I'm only
> trying to do this for my own use, not to sell apps or anything, and it would
> really help click some cocoa/Obj-C things into place for me I think.
>
> Thank You,
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--
// jack
// http://nuthole.com
// http://learncocoa.org
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