NSOutlineView reloadItem: has no effect

Question

I\'m trying to release some strain on a view-based NSOutlineView for which I changed a single item property and which I initially reloaded just fine using

Answer 1

reloadItem: works only on macOS 10.12.

From release notes: https://developer.apple.com/library/content/releasenotes/AppKit/RN-AppKit/

NSOutlineView will now reload the cell views associated with ‘item’ when [outlineView reloadItem:] is called. The method simply calls [outlineView reloadDataForRowIndexes:columnIndexes:] passing the particular row that is to be reloaded, and all the columns. For compatibility, this will only work for applications that link against the 10.12 SDK.

So, if you want to reload row on earlier systems, you should use -reloadDataForRowIndexes:columnIndexes:. Something like that:

let index = outlineView.row(forItem: obj)
let rowIndex = IndexSet(integer: index)

let cols = IndexSet(0 ... outlineView.numberOfColumns) 

outlineView.reloadData(forRowIndexes: rowIndex, columnIndexes: cols)