macOS window with integrated title bar and toolbar?

Question

In macOS how can I create a window with an "integrated title bar and toolbar" in Xcode and/or Interface Builder?

This is the "fat title bar" type

Answer 1

As of Xcode 10, you can do this in your XIB or storyboard by turning on the “Hide Title” check box under the window's title in the window's Attributes Inspector.

Note also that you should use the “Textured Rounded” style for toolbar buttons.