On Nov 19, 2013, at 8:42 PM, Quincey Morris
<quinceymor...@rivergatesoftware.com> wrote:
> Here’s something puzzling, unless I’m missing the obvious:
>
> I’m intending to convert an outline view in an existing xib file from
> cell-based to view-based. In preparation, I added the requisite delegate
> method to the view controller:
>
>> - (NSView*) outlineView: (NSOutlineView*) outlineView viewForTableColumn:
>> (NSTableColumn*) column item: (id) item {
>> if (!item || !column)
>> return nil;
>> NSTableCellView* view = [outlineView makeViewWithIdentifier:
>> column.identifier owner: self];
>> if (!view)
>> return nil;
>> return view;
>> }
>
> without changing the outline view itself. Somewhat to my surprise, this
> delegate method *was* called for the outline view, and had the effect of
> causing all of the cells to display no value. I repeat: the outline view was
> still cell-based at this stage.
There’s no setting need to make it cell or view-based. It’s determined simply
by what delegate methods are implemented. It must simply be checking for
view-based methods before cell-based. Nothing special.
> OK, ignoring that and moving on, I deleted the old outline view, added a new
> one, and set it to “view-based”. Now, I find that the result of creating the
> cell view in the delegate method:
>
>> NSTableCellView* view = [outlineView makeViewWithIdentifier:
>> column.identifier owner: self];
>
> isn’t a NSTableCellView at all:
>
>> (lldb) po view
>> <NSView: 0x600000323b60>
>> (lldb) po [view class]
>> NSView
>> (lldb) po [view objectValue]
>> error: Execution was interrupted, reason: Attempted to dereference an
>> invalid ObjC Object or send it an unrecognized selector.
>> The process has been returned to the state before expression evaluation.
>
> That’s weird problem #2. The table cell view item in IB has the default class
> (“NSTableCellView” in gray) in the inspector, but the outline view is not
> creating a cell view of that class. Huh? The consequence is that I can’t get
> a value into the text field of the cell view.
Did you set up the cell's identifier?
--
Seth Willits
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