> On 8 Apr 2016, at 10:05 PM, Nivek Research <[email protected]> wrote:
>
> Hi Graham,
> I believe the part you are missing is the ability to use bindings and ideally
> bindings setup in IB.
So, according to the documentation:
"NSView subclasses can expose additional key-value-coding/key-value-observing
compliant properties as bindings by calling the class method exposeBinding: for
each of the properties. This is typically done in the class’s initialize
method. By exposing the bindings that an object supports and creating an
Interface Builder palette, you can make instances of your own classes bindable
in Interface Builder.”
If this information is still correct, then adding the following *ought* to work:
+ (void) initialize
{
[[self class] exposeBinding:@"selectedIndex"];
}
However, I just tried it, and IB doesn’t show the binding. I don’t use bindings
myself, so I’m unsure what else needs to be done. The mention of IB palettes is
woefully out of date, so maybe this is no longer supported.
Regardless, your model does not need to know about this view. Your controller
might, and could effect the binding in code, using -[NSObject
bind:toObject:withKeyPath:options:] and an outlet to the group view. As work
goes, that’s pretty minimal, and affects only the controller, as it should.
> However, I am looking for a solution that requires no modification to the
> model and especially no understanding of a custom view and its properties.
> Ideally I would also like one that can mostly be configured from IB as one
> would do today with NSMatrix.
Well, you can stick with NSMatrix. But unless Apple come up with something like
this type of group view that you can bind to (if bindings for custom views
don’t work these days), you don’t have many other options. But any code would
be in the controller, not the model, so I don’t see that should be a problem.
—Graham
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