python - 使用Swift，如何在Python中像这样的短脚本重新编码然后解码一个字符串？

XKCD的API有一些问题，编码也有一些奇怪的问题。
Minor encoding issue with xkcd alt texts in chat
解决方案（在Python中）是将其编码为latin1，然后解码为utf8，但如何在Swift中做到这一点呢？
测试字符串：

"Be careful\u00e2\u0080\u0094it's breeding season"

预期产量：

Be careful—it's breeding season

Python（来自上面的链接）：

import json
a = '''"Be careful\u00e2\u0080\u0094it's breeding season"'''
print(json.loads(a).encode('latin1').decode('utf8'))

斯威夫特是怎么做到的？

let strdata = "Be careful\\u00e2\\u0080\\u0094it's breeding season".data(using: .isoLatin1)!
let str = String(data: strdata, encoding: .utf8)

那不管用！

最佳答案

您必须先解码JSON数据，然后提取字符串，最后“修复”字符串。下面是一个自包含的示例，其中的JSON来自https://xkcd.com/1814/info.0.json：

let data = """
    {"month": "3", "num": 1814, "link": "", "year": "2017", "news": "",
    "safe_title": "Color Pattern", "transcript": "",
    "alt": "\\u00e2\\u0099\\u00ab When the spacing is tight / And the difference is slight / That's a moir\\u00c3\\u00a9 \\u00e2\\u0099\\u00ab",
    "img": "https://imgs.xkcd.com/comics/color_pattern.png",
    "title": "Color Pattern", "day": "22"}
""".data(using: .utf8)!

// Alternatively:
// let url = URL(string: "https://xkcd.com/1814/info.0.json")!
// let data = try! Data(contentsOf: url)

do {
    if let dict = (try JSONSerialization.jsonObject(with: data, options: [])) as? [String: Any],
        var alt = dict["alt"] as? String {

        // Now try fix the "alt" string
        if let isoData = alt.data(using: .isoLatin1),
            let altFixed = String(data: isoData, encoding: .utf8) {
            alt = altFixed
        }

        print(alt)
        // ♫ When the spacing is tight / And the difference is slight / That's a moiré ♫
    }
} catch {
    print(error)
}

如果你只有一串表格
小心点\u00e2\u0080\u0094是繁殖季节
然后您仍然可以使用JSONSerialization解码\uNNNN
转义序列，然后继续如上所述。
一个简单的例子（为简洁起见省略了错误检查）：

let strbad = "Be careful\\u00e2\\u0080\\u0094it's breeding season"
let decoded = try! JSONSerialization.jsonObject(with: Data("\"\(strbad)\"".utf8), options: .allowFragments) as! String
let strgood = String(data: decoded.data(using: .isoLatin1)!, encoding: .utf8)!
print(strgood)
// Be careful—it's breeding season