编辑代码

struct Card {
    var rank: rank
    var suit: suit
    func simpleDescription() -> String {
        return "The \(rank.simpleDescription()) of \(suit.simpleDescription())"
    }
}
let threeOfSpades = Card(rank: .Three, suit: .Spades)
let threeOfSpadesDescription = threeOfSpades.simpleDescription()



enum ServerResponse{
    case Result(String,String)
    case Failure(String)
}

let success = ServerResponse. Result( "6:00 am", "8:09 pm")
let Failure = ServerResponse. Failure("Out of cheese.")

switch success {
case let .Result(sunrise,sunset):
      let ServerResponse = "Sunrise is at \(sunrise) and sunset is at \(sunset)."
      case let .Failure(message):
          print("Failure... \(message)") 
}