从swift中的struct调用方法 [英] calling method from struct in swift

问题描述

我发现这里有一个优雅的方法来迭代枚举：如何枚举带有String类型的枚举？

I found what looks like an elegant solution to iterating over enums here: How to enumerate an enum with String type?

接下来，我无法弄清楚如何调用此方法。在面值方面，它看起来不像一个参数，但是当我尝试调用Card.createDeck（）时，我得到一个编译器错误告诉我错误：参数＃1在调用中缺少参数。

Next, I'm having trouble figuring out how to call this method. At face value, it doesn't look like it takes an argument, but when I try to call Card.createDeck() I get a compiler error telling me "error: missing argument for parameter #1 in call".

请让我知道我在这里做错什么？我应该传递给这个方法？

Please let me know what I'm doing wrong here? What am I supposed to pass to this method?

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
    }

}

推荐答案

createDeck（）是一个实例方法。执行 Card.createDeck（）是对不存在的类方法的调用。

createDeck() is a instance method. Doing Card.createDeck() is a call to a class method that doesn't exist.

class func - 类方法

编辑：

我误读它是一个结构体，但是相同的逻辑适用。

I misread that it was a struct, but the same logic applies.

static func - 用于静态方法

static func - for static methods

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