.swift

enum BooType {
  case play
}

protocol FooDelegate {
    func onBoo(boo: BooType)
}

class Foo {
  var delegate: FooDelegate?
  
  func someFunc() {
    delegate?.onBoo(boo: .play)
  }
}
// some other file
class Bar: FooDelegate {
  func onBoo(boo: BooType) {
    switch boo {
      case .play {
        // is this possible?
      }
    }
  }
}