On Jul 12, 2014, at 9:20 AM, Navneet Kumar wrote:
> I had one (set cell-based in IB) outline view in my project using custom cell
> for one table Column (identifier : “Description”).
> And it was working fine with my AppDelegate implementing the required
> datasource and some delegate methods.
>
> I added another (set view-based in IB) outline view and I am returning custom
> views in the following method (in AppDelegate):
>
> - (NSView *)outlineView:(NSOutlineView *)outlineView
> viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item {
> NSString *identifier = [tableColumn identifier];
> if ([outlineView isEqualTo:outlineViewThumbs]) {
> if ([identifier isEqualToString:COLUMN_ID_DESC]) {// having
> only one table column
> return [item cellView];
> }
> }
> return nil;
> }
>
> This view-based outline view is working as expected, but the earlier
> cell-based outline is now showing empty rows (yes, it does populate as is
> evident from the vertical scroller and clicking also selects the row).
> Adding a breakpoint in the above method, I can see it being called by
> cell-based outline view, and in this case this method returns nil. And the
> outlineView: objectValueForTableColumn: item: method doesn’t get called.
> If I comment the last line in above method and return nothing for the
> cell-based outline view, the outlineView: objectValueForTableColumn: item: is
> called after the above method, but it leads to crash at another place in code
> where I’m doing [tabView display];. This tabView contains both the outline
> views in separate tabs.
>
> How to tackle it?
> Do I need to use two separate classes for datasource and delegate for the two
> outline views?
Most likely. As far as I can tell, there is no public property that tells an
NSTableView whether it is cell-based or view-based, so I am not surprised that
it determines this based on implemented delegate methods. Alternatively, since
cell-based table views are being deprecated, you could convert your cell-based
to view-based and then your app will have some future-proofing.
HTH,
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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