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如何在Swift中将Unicode字符转换为Int

分类: 技术问答 • 2022-03-24 17:05:39

如何在Swift中将Unicode字符转换为Int

问题描述：

用户询问以下问题以我的一个答案。


我有一个unicode字符 \ u {0D85} 。如何从中获取 Int 值？

我打算去将它们引用到另一个Stack Overflow Q& A但我找不到一个。这些是指转换另一个方向：

I was going to refer them to another Stack Overflow Q&A but I couldn't find one. These refer to converting the other direction:

  • How to convert an Int to a Character in Swift
  • How can I get the Unicode codepoint represented by an integer in Swift?

这些似乎是在询问如何将字符串形式的数字转换为实际的 Int （如将1转换为 1 ）。

And these seem to be asking how to convert a number in string form to an actual Int (as in converting "1" to 1).

  • Convert Character to Int in Swift 2.0
  • Convert Character to Int in Swift

而不是尝试将我的答案放在co中请问提问者，我将在下面提供答案。 \ u {0D85} 的类型有点不清楚，但我将介绍各种可能性。

Rather than try to fit my answer in a comment to the asker, I am going to provide an answer below. The Type of \u{0D85} is somewhat unclear but I will cover the various possibilities.

答

Hex到Int

如果您从 \ u {0D85}开始并且您知道Unicode字符的十六进制值，那么您也可以使用以下格式编写它，因为它已经是 Int 。 / p>

If you are starting with \u{0D85} and you know the hex value of the Unicode character, then you might as well write it in the following format because it is an Int already.

let myInt = 0x0D85                          // Int: 3461

字符串到Int

我假设你有 \u {0D85}（引号中），默认情况下为 String 。由于它是 String ，因此您不能确定您只有一个 Int 值一般情况。

I assume, though, that you have "\u{0D85}" (in quotes), which makes it a String by default. And since it is a String, you can't be certain that you will only have a single Int value for the general case.

let myString = "\u{0D85}"

for element in myString.unicodeScalars {
    let myInt = element.value               // UInt32: 3461
}

我本可以使用 myString.utf16 和让myInt = Int（元素），但我发现它更容易当有可能出现像表情符号这样的东西时，处理Unicode标量值（UTF-32）。 （有关详细信息，请参阅此答案。）

I could have also used myString.utf16 and let myInt = Int(element), but I find it easier to deal with Unicode scalar values (UTF-32) when there is a possibility of things like emoji. (See this answer for more details.)

字符到Int

Swift 字符，这是扩展字形集群，没有 utf16 或 unicodeScalars 属性，所以如果你从字符开始然后首先将其转换为 String ，然后按照上面 String to Int 部分中的说明进行操作。

Swift Character, which is an extended grapheme cluster, does not have a utf16 or unicodeScalars property, so if you are starting with Character then convert it to a String first and then follow the directions in the String to Int section above.

let myChar: Character = "\u{0D85}"
let myString = String(myChar)

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