ios - 在swift 4中更改自动打印数字的某个字符串

Question

我想复制此页面 http://www.99-bottles-of-beer.net/lyrics.html在 IOS Playground 上练习，但我想问一个问题，希望对您有所帮助。我创建了一个名为 vantanoveBottles 的函数，创建了一个字符串类型的变量“文本”，并将“for 和 in”用于 0 ... 5 之间的数字如代码中所示。现在，如果您比较站点时的 1 并表示没有更多啤酒，请不要使用数字 0，而是我会退出，所以我基本上会打印 1 到 98 的示例数字与字符串文本，(我这样做了)然后来到 1 不应该出去“1 瓶啤酒在墙上，1 瓶啤酒。\n”取下并传递它，0 瓶啤酒在墙上。 "0一定要消掉不能出去，怎么办？这是测试代码

func novantanoveBottles () ->String {
    var testi: String = ""

    for numeri in (1...99).reversed() {
        let newLine:String = "\n \(numeri) bottles of beer on the wall, \(numeri) bottles of beer.\n Take one down and pass it around, \(numeri - 1) bottles of beer on the wall. \n"
        testi += newLine
    }

    testi += "\n \n \n No more bottles of beer on the wall, no more bottles of beer. Go to the store and buy some more, 99 bottles of beer on the wall."

    return testi
}

print(novantanoveBottles())

Answer 1

您可以在添加那部分文本之前添加一个检查

for numeri in (1...99).reversed() {
    let newLine:String = "\n \(numeri) bottles of beer on the wall, \(numeri) bottles of beer.\n Take one down and pass it around"
    if numeri != 1 {
        test1 += ", \(numeri - 1) bottles of beer on the wall. \n
    } else {
        test1 += ".\n"
    }
    testi += newLine
}