How can I create Yosemite-style unified toolbar in Interface Builder?

Question

In OS X 10.10+ how can I create the "fat titlebar" kind of window that has a toolbar integrated with other gadgets in the window's title bar, like in the new Safari and Calendar?

Answer 1

1. Create a standard toolbar

2. When the window loads set:

   window.titleVisibility = NSWindowTitleHidden; // or .Hidden in Swift
   

Answer 2

In your Window Controller:

Put the following into your windowDidLoad override function.

self.window!.titleVisibility = NSWindowTitleVisibility.Hidden

Answer 3

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.