ios - 在单独的类中声明变量的类类型[Swift]

在这里，我有一个名为Player的类，该类的变量类型为Sport，可以是Basketball或Soccer。我希望能够在Player声明中声明Sport的类型。有什么建议么？

class Soccer : Sport {
    override var players : Int { get { return 11 } }
}

class Basketball : Sport {
    override var players : Int { get { return 5 } }
}

class Sport {

    var teamName: String
    var players: Int { get { return 0 } }

    init(teamName: String) {
        self.teamName = teamName
    }

}

class Player {
    let sport : Sport?

    init? (typeOfSport: Soccer, teamName: String) {
        self.sport = Soccer(teamName: teamName)
    }

    init? (typeOfSport: Basketball, teamName: String) {
        self.sport = Basketball(teamName: teamName)
    }
}

let me = Player(typeOfSport: Soccer(), teamName: "chelsea")

let him = Player(typeOfSport: Basketball(), teamName: "wizards")

最佳答案

您也可以像这样使用枚举:

enum Sport {
    case Soccer (teamName : String)

    var players: Int {
        switch self{
            case .Soccer: return 11
            default: return 0
        }
    }
}

class Player {
    let sport: Sport?
    init? (s : Sport){
        self.sport = s
    }
}

Sport.Soccer (teamName: "Cambuur").players

关于ios - 在单独的类中声明变量的类类型[Swift]，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29016631/