Re: Binding to selection of NSArrayController
Re: Binding to selection of NSArrayController
- Subject: Re: Binding to selection of NSArrayController
- From: Jonathan Taylor <email@hidden>
- Date: Tue, 23 Sep 2014 17:32:48 +0100
Ah brilliant, that’s fixed it - thanks very much! Makes sense in retrospect that I would have to do that, but hadn’t crossed my mind at the time.
Cheers
Jonny
On 23 Sep 2014, at 17:26, Marek Hrušovský <email@hidden> wrote:
> This sounds like that selection from nstableview is not properly linked. Make sure that selectionIndex (or something similar) from table is linked to arraycontroller
>
> On Tue, Sep 23, 2014 at 6:15 PM, Jonathan Taylor <email@hidden> wrote:
> Hi all,
>
> I feel this should be a very simple question, but I am struggling with it - the tutorials and online info I can find is either 5 years out of date or seem to imply that I am doing everything right!
>
> In my code I have an NSMutableArray of “message” objects, each with a number of properties defined on them. In the GUI this is wired up to a table view, via an NSArrayController. That all seems to work fine, and the object properties are listed in the table[*].
>
> Underneath the table I want to display some more detailed information about the currently-selected object in the table. I would have thought that I could do this just by binding the relevant NSTextField to MessageArray.selection.myExtendedInformationProperty. This works up to a point, in that I do see text appearing in the text field. However it does not update when the selection in the table view changes, which is what I had intended to happen.
>
> This is basically what happens on p18 of this tutorial (http://web.stanford.edu/class/cs193e/Downloads/CocoaBindingsTutorial.pdf), and (although it’s referring to a much older version of IB) I think I have done what they do.
>
> Can anyone suggest what I may have omitted to do here, or why my approach is wrong? Thanks for any advice.
> Cheers
> Jonny.
>
>
> [*] One slight glitch - if I add an object to the NSMutableArray then it does not immediately show up in the table, I have to call will/didChangeValueForKey on the property that returns the array. I don’t know if that is expected behaviour (maybe I should be adding via the array controller somehow?). This is not a problem, but I mention it for completeness, just in case it’s indicative of something funny that is going on that I don’t fully appreciate.
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