How to change the color of a NSToolbarItem's label

Question

I'd like to change the color of all of my NSToolbarItem's labels.

I need to set it to white because it suits better to the background color of my NSWindow, but it defaults to black and I haven't found a way to change it neither in Interface Builder nor directly by code (NSToolbarItem implements setLabel, but it just sets the text string).

If possible, I'd like to avoid:

• Replacing the whole NSToolbar by a custom NSView. Would feel like reinventing the wheel to me.
• Having to create custom NSViews inside NSToolbarItem. It would imply having to leave blank all of its labels and adding the white-colored label inside the custom view.

Answer 1

In case anyone is interested, I solved it by:

• Using custom views inside NSToolbarItems containing both a button and a label.
• Displaying icon only instead of icon + label in NSToolbar in order to hide the default label.

I had to deal with another problem related to a bug with Interface Builder: the custom view was not showing at all. I was able to fix it thanks to this answer.