将Unicode符号或其XML / HTML实体转换为Swift中的Unicode编号 [英] Convert Unicode symbol or its XML/HTML entities into its Unicode number in Swift

问题描述

给定一个unicode符号为 String 或其XML / HTML实体，如何生成其Unicode编号？例如，如果给出字符串෴，并且可以生成其HTML代码（&＃3572; U + 0DF4 ）？

我目前正在生成HTML实体通过使用 CFStringTransform API并使用 kCFStringTransformToXMLHex 进行转换。但是这个unicode数字本身并没有一个转换。

解决方案

update： Xcode 9•Swift 4

 扩展字符串{
 var html2AttributedString：NSAttributedString？ {
 do {
 return try NSAttributedString（data：Data（utf8），options：[.documentType：NSAttributedString.DocumentType.html，.characterEncoding：String.Encoding.utf8.rawValue]，documentAttributes：nil） 
} catch {
 print（error）
 return nil 
} 
} 
 var unicodes：[UInt32] {return unicodeScalars.map {$ 0.value }} 
 
 code $ <$ $ p 
 $ b 
  Xcode 8•Swift 3  
 扩展字符串{
 var html2AttributedString：NSAttributedString？ {
 do {
 return try NSAttributedString（data：Data（utf8），options：[NSDocumentTypeDocumentAttribute：NSHTMLTextDocumentType，NSCharacterEncodingDocumentAttribute：String.Encoding.utf8.rawValue]，documentAttributes：nil）
} catch {
 print（error）
 return nil 
} 
} 
 var unicodes：[UInt32] {return unicodeScalars.map {$ 0.value}} 
 } 
  
 
 
 
 
 
 
  let str =< span>& euro;€< / span>。html2AttributedString？.string ?? 
 print（str.unicodes）// [8364，8364] 
  
 
Given either a unicode symbol as a String or its XML/HTML entities, how could one generate its Unicode number? For example if you're given the string "෴", and you could generate its HTML code (&#3572;), how could you then generate its Unicode number (U+0DF4)?

I am currently generating the HTML entities by using the CFStringTransform API and using kCFStringTransformToXMLHex for the transform. But there isn't a transform for the unicode number itself.
解决方案
update: Xcode 9 • Swift 4
extension String {
    var html2AttributedString: NSAttributedString? {
        do {
            return try NSAttributedString(data: Data(utf8), options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            print(error)
            return nil
        }
    }
    var unicodes: [UInt32] { return unicodeScalars.map{$0.value} }
}
Xcode 8 • Swift 3
extension String {
    var html2AttributedString: NSAttributedString? {
        do {
            return try NSAttributedString(data: Data(utf8), options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            print(error)
            return nil
        }
    }
    var unicodes: [UInt32] { return unicodeScalars.map{$0.value} }
}




let str = "<span>&euro;€</span>".html2AttributedString?.string ?? ""
print(str.unicodes)     // [8364, 8364]


                        
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