问题
I want to update the column width to the width of the widest entry whenever a node in my NSOutlineView is expanded. Thus, my delegate listens to outlineViewItemDidExpand and calls
[column setWidth:maxColumnWidth];
in it. maxColumnWidth is the width of the widest entry.
However, for some reason, calling setWidth from inside outlineViewItemDidExpand doesn't seem to do anything. When I call it later, e.g. as a response to a button click, it works just fine, but from within outlineViewItemDidExpand it just does nothing.
So any idea what I could do to update the column width whenever the user clicks on an expander icon? Thanks!
来源：https://stackoverflow.com/questions/65186668/cant-change-column-width-in-response-to-outlineviewitemdidexpand