Ios 如何在标签的NSMutableAttributeString中禁用下划线URL

我有一个带有属性文本的标签。文本有url链接，该链接用默认的蓝色下划线。如何删除

nsmutableAttributeString

的url下划线样式

func htmlToAttributedString(_ html: String) -> NSAttributedString? {
    guard let data = NSString(string: html).data(using: String.Encoding.utf8.rawValue) else { return nil }
    do {
        let attrStr = try NSAttributedString(data: data,
                                      options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue],
                                      documentAttributes: nil)
        let range = NSRange(location: 0, length: attrStr.length)
        let str = NSMutableAttributedString(attributedString: attrStr)
        str.addAttributes([NSAttributedString.Key.font: UIFont.systemFont(ofSize: 17.0)], range: range)
        str.addAttribute(NSAttributedString.Key.underlineStyle, value: 0, range: range)
        return NSAttributedString(attributedString: str.attributedSubstring(from: range))
    } catch {}
    return nil
}

我尝试了上面的代码，但它仍然显示装饰链接

---

通过
attributedString
中的属性枚举

，并删除链接的属性

attributedString.enumerateAttributes(in: NSRange(location: 0, length: attributedString.length), options: []) { attributes, range, stop in                
    attributedString.removeAttribute(.link, range: range)
    attributedString.removeAttribute(.foregroundColor, range: range)
    attributedString.removeAttribute(.underlineStyle, range: range)

}

---

检查此项：try:str.removeAttribute（.underlineStyle，range:range）

removeAttribute

不起作用。