如何在 Swift 2.0 中获取字符串的长度?

How can I get the length of a String in Swift 2.0?

到目前为止是:

let string = "my example string"
if count(string) >= 3 { ... }

但现在我得到一个错误:

count is unavailable: access the count property on the collection. Type String doesn't conform to protocol CollectionType

哦,很简单:

string.characters.count

再次简化版本

在 Swift 4.0 及更高版本中

let strLength = string.count

应该是这样

let string = "my example string"
let length = string.characters.count

因为在 Swift 2.0 Apple 中将全局函数更改为协议扩展。