A neat shortcut you can use now with literals is `@(button)` instead of the more cumbersome `NSNumber` methods.

Also, when I see a variable called `button` being used as a number like that, it makes me question its name (since a button can't be a number). The `enum` in this case might warrant a different name (perhaps `PasscodeButtonType` for example, and then this variable would be `buttonType`).