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Editorial Team
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Asked: 2026-05-16T10:10:32+00:00

I’m making a custom view that I want to be bindings/core data compatible and

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I’m making a custom view that I want to be bindings/core data compatible and represent a collection of data (a la NSTableView)

Is there any way my view can refer to a specific subset of the elements in the collection (other than the current selection) after a change by the user?

A bit of context:
The view is going to display a number of user-moveable boxes in a 2D space. Each box corresponds to a record in the model. Several can be moved at once, and I can’t rely on the delta value being the same for each box (so no adding a delta to each selected object).

I guess I’m looking for something like an id assigned to each element of the content array by NSArrayController, so that the view can associate that id with each box. My first thought was to use the the index in a content array, but this could be messed up by undo/redo. I could subclass NSArrayController and get it to auto-generate an id for each model item, but does cocoa already do something like this already? Feels like I might be missing something.

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1 Answer

  1. Editorial Team

    Why not just refer to the objects themselves? You can keep them in a set or array, whichever is appropriate.

    If you really need an identifier of some sort: What for? What are you going to do with it?

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