swift - 在 Swift 中重载方法时“参数标签不正确”

Question

我正在尝试使用以下代码在 Swift 中进行方法重载:

struct Game {
    private let players: [UserProfile] //set in init()
    private var scores: [Int] = []

    mutating func setScore(_ score: Int, playerIndex: Int) {

        //... stuff happening ...

        self.scores[playerIndex] = score
    }

    func setScore(_ score: Int, player: UserProfile) {
        guard let playerIndex = self.players.index(of: player) else {
            return
        }

        self.setScore(score, playerIndex: playerIndex)
    }
}

我在 self.setScore 行遇到错误:

调用中的参数标签不正确(有 _:playerIndex:，预期为 _:player:)

我已经查看这段代码一段时间了，但无法弄清楚为什么这行不通。有什么提示吗？

Answer 1

感谢@Hamish 为我指明了正确的方向。

事实证明，编译器消息具有误导性。问题是每个调用 mutating 方法的方法本身都必须是 mutating。所以这解决了问题:

struct Game {
    private let players: [UserProfile] //set in init()
    private var scores: [Int] = []

    mutating func setScore(_ score: Int, playerIndex: Int) {

        //... stuff happening ...

        self.scores[playerIndex] = score
    }

    mutating func setScore(_ score: Int, player: UserProfile) {
        guard let playerIndex = self.players.index(of: player) else {
            return
        }

        self.setScore(score, playerIndex: playerIndex)
    }
}

另见 .sort in protocol extension is not working