Swift 2.2循环通过字符串并得到char＆amp;指数

Question

我试图循环遍历String获取字符及其索引。听起来很简单..但我没有找到正确的语法。

以下是我的尝试：

let str = "testString"
for (index, char) in str.characters  {
    print(index)
    print(char)
}

或

for (index, char) in enumerate(str.characters)  {...}

Answer 1

let str = "testString"
for (index, element) in str.characters.enumerate() {
    print(index)
    print(element)
}

Answer 2

Swift 4

let str = "Swift 4"
for (index, element) in str.enumerated() {
    print(index)
    print(element)
}