如何在Swift中间接显示给定的Unicode字符? [英] How to display indirectly given unicode character in Swift?

问题描述

在JSON数据文件中，我有一个Unicode字符，如下所示:

In a JSON data file, I have a unicode character like this:

{
    "myUnicodeCharacter": "\\u{25a1}"
}

我知道如何从JSON文件读取数据.当它包含上面表示的字符时，就会发生此问题.

I know how to read data from JSON files. The problem occurs when it contains characters which are represented as above.

我将其读入字符串变量myUnicodeCharacterString中，该变量的值为"\ u {25a1}".顺便说一下，我无法在JSON数据文件中使用单个斜杠，因为在这种情况下，它无法将文件中的数据识别为正确的JSON对象，并返回nil.

I read it in to a String variable, myUnicodeCharacterString, which gets the value "\u{25a1}". I couldn't by the way use a single slash in the JSON data file because in such case it doesn't recognize the data in the file to be a proper JSON object, returning nil.

但是，当将值分配给用于显示它的对象(例如SKLabelNode)时，该值不会被编码为其图形表示形式:

However, the value is not encoded to its graphical representation when it’s assigned to something for displaying it, for example a SKLabelNode:

mySKLabelNode.Text = myUnicodeCharacterString // displays "\u{25a1}" and not a hollow square

问题归结为:

// A: direct approach, does works
let unicodeValueByValue = UnicodeScalar("\u{25a1}") // "9633"
let c1 = Character(unicodeValueByValue) // "a hollow square"

// B: indirect approach, this does not work
let myUnicodeString = "\u{25a1}"
let unicodeValueByVariable = UnicodeScalar(myUnicodeString) // Error: cannot find an initialiser
let c2 = Character(unicodeValueByVariable)

那么，如果代码中没有直接给出该字符，该如何显示格式为\ u {xxxx}的unicode字符?

So, how do I display a unicode character of the format "\u{xxxx}" if it's not directly given in code?

推荐答案

更好的方法是使用正确的\uNNNN转义序列 JSON中的Unicode字符(有关详细信息，请参见 http://json.org ). 这是由NSJSONSerialization自动处理的，您不必 必须转换一个十六进制代码.

A better way would be to use the proper \uNNNN escape sequence for Unicode characters in JSON (see http://json.org for details). This is automatically handled by NSJSONSerialization, and you don't have to convert a hex code.

在您的情况下，JSON数据应为

In your case the JSON data should be

{
    "myUnicodeCharacter" : "\u25a1"
}

这是一个完整的独立示例:

Here is a full self-contained example:

let jsonString = "{ \"myUnicodeCharacter\" : \"\\u25a1\"}"
println(jsonString)
// { "myUnicodeCharacter" : "\u25a1"}

let dict = NSJSONSerialization.JSONObjectWithData(jsonString.dataUsingEncoding(NSUTF8StringEncoding)!,
            options: nil, error: nil) as [String : String]

let myUnicodeCharacterString = dict["myUnicodeCharacter"]!
println(myUnicodeCharacterString)
// □

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