How do you create custom notifications in Swift 3?

Question

In Objective-C, a custom notification is just a plain NSString, but it\'s not obvious in the WWDC version of Swift 3 just what it should be.

Answer 1

if you use string-only custom notifications, there's no reason to extend any classes but String

    extension String {
        var notificationName : Notification.Name{
            return Notification.Name.init(self)
        }
    }