異なるenumタイプをenumの元のタイプとして使用すると問題が発生します.

enum GameResult {
    case win
    case loss
    case tie
}

enum Game: GameResult {
    case 가위바위보 = GameResult.win
    case 묵찌빠 = GameResult.tie
}

enum GameResult: String {
    case win = "win"
    case loss
    case tie
}

enum Game: GameResult {
    case 가위바위보 = GameResult.win
    case 묵찌빠 = GameResult.tie
}

上の2つのコードのエラー文

'Game' declares raw type 'GameResult', but does not conform to RawRepresentable and conformance could not be synthesized

Do you want to add protocol stubs?

Raw type 'GameResult' is not expressible by a string, integer, or floating-point literal

Raw value for enum case must be a literal

元の値はテキスト値のみです.
文字は何ですか.String or Int or Floating-point
=enumタイプのcaseの元の値はliteralとして表すことはできませんか?
String or Inter Floating-pointではなくenumタイプ?

異種

Swift Literals

A literal is a representation of a value in source code, such as a number or a string. Swift provides the following kinds of literals: