A Swift Tour. Write an enumeration that conforms to this protocol.

protocolEnumeration

protocol ExampleProtocol {
    var simpleDescription: String { get }
    mutating func adjust()
}

enum SimpleEnum : String, ExampleProtocol {
    case Before = "", After = " (whatever)"
    var simpleDescription: String {
        get {
            return "A simple enum." + self.rawValue
        }
    }
    mutating func adjust() {
        self = .After
    }
}
var c = SimpleEnum.Before
c.adjust()
c.simpleDescription

Hi, I typed your code but Xcode(8.3.2) gave me a compiler error for raw type error. The codes in the following are modified according to your codes.

enum SimpleEnumeration: ExampleProtocol {
	case Before, After
	var simpleDescription: String {
		get {
		    return "A simple enum."
		}
	}
	
	mutating func adjust() {
		self = .After
	}

}

var c = SimpleEnumeration.Before
a.adjust()
c.simpleDescription