解码HTML字符串 [英] Decode HTML string

问题描述

如何解码我的html字符串： b

 < span> Bj& ouml; rn< / span> 
  

至

 <跨度>&比约恩LT; /跨度> 
  

在Swift 3中？

解决方案

您真的需要保留< span> 标签，同时替换& ouml; 符号？ Leo Dabus在将Unicode符号或其XML / HTML实体转换为Swift中的Unicode编号中提出的一种技术将转换符号包括通过一个属性字符串往返。

在Swift 4中：

 扩展字符串{
 ///将HTML字符串转换为`NSAttributedString` 
 
 var htmlAttributedString：NSAttributedString？ {
返回尝试？ NSAttributedString（data：Data（utf8），options：[.documentType：NSAttributedString.DocumentType.html，.characterEncoding：String.Encoding.utf8.rawValue]，documentAttributes：nil）
} 
} 
  

如果您想要一个属性字符串（例如，用于 UILabel
pre $ let string =Bj& ouml; rn是< em>很棒的< / em>名称
label.attributedText = string.htmlAttributedString


这将 Bj&将 < / em>


如果您只是想转换HTML符号并去掉HTML标签（例如< span> ; / < / span> ），只需抓住字符串：

  let string =Bj& ouml; rn is< em> great< / em> name
 if let result = string.htmlAttributeString？.string {
 print（result） //Björn是个好名字
} 
  





---

对于之前的Swift版本，请参阅此答案的以前的版本。

How can I decode my html string from:

<span>Bj&ouml;rn</span>

to

<span>Björn</span>

in Swift 3 ?

解决方案

Do you really need to preserve the <span> tags, while replacing the ö symbol? One technique, suggested by Leo Dabus in Convert Unicode symbol or its XML/HTML entities into its Unicode number in Swift, converts the symbols includes round-tripping it through an attributed string.

In Swift 4:

extension String {
    /// Converts HTML string to a `NSAttributedString`

    var htmlAttributedString: NSAttributedString? {
        return try? NSAttributedString(data: Data(utf8), options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
    }
}

If you want an attributed string (for example, for use in a UILabel)

let string = "Bj&ouml;rn is <em>great</em> name"
label.attributedText = string.htmlAttributedString

This converts Björn to Björn and italicizes the <em>...</em> portion, too.

If you just want to convert the HTML symbols and strip out the HTML tags (such as your <span>/</span>), just grab the string:

let string = "Bj&ouml;rn is <em>great</em> name"
if let result = string.htmlAttributedString?.string {
    print(result)   // "Björn is great name"
}

---

For prior Swift versions, see previous revision of this answer.

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