How to disable NSButton focus outline

Question

When my application launches, it has one button. This button has ended up with a very ugly blue outline. How can I disable this? (Code or Interface Builder solution welcome.)

Answer 1

In interface builder click on the button and then in the right hand panel go to the Attributes inspector. At the bottom of the attributes panel there is a section called "View". The first item in that section is "Focus Ring". Change this value to 'None'.

Answer 2

It's 2016 and this is how you do it programmatically in Swift 2.2:

view.focusRingType = .None