How to set the form's default button in Xcode?

Question

In a OS X app, if I have a form with a couple of buttons, how do I nominate a default button for the form? By default button I mean the button that acts when I hit Enter.

I've been trying to learn Swift, and so I've been experimenting building little OS X apps using Xcode 6.

All my programming experience is in Windows desktop applications, so I might be looking at this all wrong, and maybe using the wrong terminology here.

Answer 1

Set they button's key equivalent to \r. This is most easily done in Interface Builder by selecting "Key Equivalent" and pressing Enter.