Re: Selected value binding in popups
Re: Selected value binding in popups
- Subject: Re: Selected value binding in popups
- From: Rick Mann <email@hidden>
- Date: Thu, 16 Jun 2016 13:12:52 -0700
> On Jun 16, 2016, at 10:14 , Keary Suska <email@hidden> wrote:
>
>
>> On Jun 15, 2016, at 10:15 PM, Rick Mann <email@hidden> wrote:
>>
>> I have a popup menu that's bound to an NSArrayController of AVCaptureDevice objects. These objects have a "localizedName" property that I use for the content values, and the content and content objects point to the NSArrayController.
>>
>> I also have a property on my view controller used for the selected object.
>>
>> The problem comes when I re-build the array of objects that backs the NSArrayController (in the case where the selected device disappears): I assign a new array to the property, and the selected item in the popup menu changes to be the object description for the AVCaptureDevice object still in the selected property.
>>
>> IB doesn't let me bind to selected value when I'm binding to selected object. Is there anything I can do here?
>
> IIRC, this is what happens when the selected object doesn’t exist in the content array (or for whatever reason cannot be found by the API). Are you simply modifying the content array (adding/removing), or re-creating objects?
>
> In any case, you might have better results using KVC-compliat mutator methods on the content array rather than replacing it entirely.
Unfortunately, I get a new array from macOS. It's substantially more work to try to manage the changes myself.
> On Jun 16, 2016, at 11:16 , Ken Thomases <email@hidden> wrote:
>
> Why not clear the property for the selected object? Or assign it to one of the (new?) objects in the array?
Well, I can, but I wonder why I should have to. I think it's nice for the UI to keep the one that was selected, and let the user change to another one when ready.
The objects and values can be specified separately for the menu items, they should be specifiable for the selected item, as well (since it clearly supports having a selected item that's not a member of the array).
--
Rick Mann
email@hidden
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