辅音和元音 Swift

我是 Swift 的新手，谁能向我解释一下为什么我总是遇到这个问题。我正在使用 Xcode 6.4，但这是我的问题，我希望我能解决它，但我需要我的函数接受大字符串，然后返回 Tuple(numVowels, numConsonants) 计算以辅音/元音开头的单词数量 返回元组并打印函数调用的结果。 我不需要它计算字符数，只需要计算每个单词的第一个字符。我创建了一个 for 循环，它将所有内容切换为小写。但现在我被困住了。

func count(string: String) -> (Vowels:Int, Consonants:Int) {
    var Vowels = 0, Consonants = 0
    for character in string {
        switch String(character).lowercaseString {
            case "a","e","i","o","u":
              ++Vowels
            case "b","c","d","e","f","g","h","j","k","l","m","n","p","q","r","s","t","v","w","x","y","z":
            ++Consonants
        default: break
        }

    }
    return (Vowels, Consonants)
}

如果您使用的是 swift 2 ：

只需改变这一行

for character in string {

to

for character in string.characters {

它会工作得很好

count("hello") // (.0 2, .1 3)