Swift — Require classes implementing protocol to be subclasses of a certain class

Question

I\'m creating several NSView classes, all of which support a special operation, which we\'ll call transmogrify. At first glance, this seems like t

Answer 1

Starting from Swift 4 you can now define this as followed:

let myView: NSView & TransmogrifiableView

For more information, checkout issue #156 Subclass Existentials