计算Swift字符串的大小（以字节为单位） [英] Calculate the size in bytes of a Swift String

问题描述

我正在尝试计算Swift中 String 的字节大小，但我不知道字符的大小是多少;一个编码的字节数是多少？

I'm trying to calculate the size in bytes of a String in Swift but I don't know what the size of a character is; in how many bytes is one coded?

假设我有一个字符串：
let str =hello，world

Let's say I have a string: let str = "hello, world"

我想将它发送到我的服务器，但我的服务器只接受32字节以下的字符串。我如何控制字符串的长度？

I want to send that to my server, but my server will only accept strings under 32 bytes. How would I control the length of my string?

推荐答案

这一切都取决于字符编码，让我们假设UTF8：

It all depends on the character encoding, let's suppose UTF8:

let string = "abde"
let size = string.utf8.count

请注意，并非所有字符在UTF8中都具有相同的字节大小。
如果你的字符串是ASCII，你可以假设每个字符有1个字节。

Note that not all characters have the same byte size in UTF8. If your string is ASCII, you can assume 1 byte per character.

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