将字符串中的 unicode 符号 \\uXXXX 转换为 Swift 中的字符

Question

I'm receiving via a REST API a string which contains unicode encoded characters in form of \\uXXXX

eg Ain\’t which should be Ain't

Is there a nice way to convert these?

Answer 1

You can use \\u{my_unicode} :

print("Ain\u{2019}t this a beautiful day")
/* Prints "Ain’t this a beautiful day"

From the Language Guide - Strings and Characters - Unicode :

String literals can include the following special characters:

...

• An arbitrary Unicode scalar, written as \\u{n}, where n is a 1–8 digit hexadecimal number with a value equal to a valid Unicode code point

Answer 2

You can apply a string transform StringTransform :

extension String {
    var decodingUnicodeCharacters: String { applyingTransform(.init("Hex-Any"), reverse: false) ?? "" }
}

---

let string = #"Ain\u2019t"#
print(string.decodingUnicodeCharacters)  // "Ain’t\n"