在Swift中将Unicode标量表情符号转换为String [英] Convert unicode scalar emoji to String in Swift

问题描述

我从服务器获取的文本字符串中的表情符号获得了unicode标量，当我在 UILabel 中打印它们时，它们无法显示为表情符号。这是从服务器获取字符串的格式：

I'm getting unicode scalar for emojis in a text string that I get from a server, which fail to show up as emojis when I print them in a UILabel. This is the format in which I get my string from server:

let string = "Hi, I'm lily U+1F609"

除非更改为

let string = "Hi, I'm lily \u{1F609}"

反正我可以将字符串转换为所需的格式吗？

Is there anyway I can convert the string to the required format?

我不想使用正则表达式来确定出现的情况 U +< HEX_CODE> ，然后将它们转换为 \u {HEX_CODE} 。必须有一个更好的方法来做到这一点。

I don't want to use a regex to determine occurrences of U+<HEX_CODE> and then converting them to \u{HEX_CODE}. There has to be a better way of doing this.

推荐答案

这是正则表达式的创建对象。如果有更简单的非正则表达式解决方案，我将删除以下答案：

This is the very kind of problems that regex was created for. If there's a simpler non-regex solution, I'll delete this answer:

func replaceWithEmoji(str: String) -> String {
    var result = str

    let regex = try! NSRegularExpression(pattern: "(U\\+([0-9A-F]+))", options: [.CaseInsensitive])
    let matches = regex.matchesInString(result, options: [], range: NSMakeRange(0, result.characters.count))

    for m in matches.reverse() {
        let range1 = m.rangeAtIndex(1)
        let range2 = m.rangeAtIndex(2)

        if let codePoint = Int(result[range2], radix: 16) {
            let emoji = String(UnicodeScalar(codePoint))
            let startIndex = result.startIndex.advancedBy(range1.location)
            let endIndex = startIndex.advancedBy(range1.length)

            result.replaceRange(startIndex..<endIndex, with: emoji)
        }
    }

    return result
}

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