接下来,我无法弄清楚如何调用此方法.在面值,它看起来不像是一个参数,但当我尝试调用Card.createDeck()时,我得到一个编译错误告诉我“错误：在调用中缺少参数#1的参数”.

请让我知道我在这里做错了什么？我应该传递给这种方法的是什么？

struct Card {
    var rank: Rank
    var suit: Suit

    func simpleDescription() -> String {
        return "The \(rank.simpleDescription()) of \(suit.simpleDescription())"
    }

    func createDeck() -> [Card] {

        var deck = [Card]()

        var n = 1
        while let rank = Rank.fromRaw(n) {

            var m = 1
            while let suit = Suit.fromRaw(m) {
                deck += Card(rank: rank,suit: suit)
                m++
            }
            n++
        }

        return deck
    }

}