ios - 如何用nsattribute快速替换html标签？

例如。用粗体替换<strong>标记。这样就可以将其作为属性文本应用到标签，文本字段或textview

最佳答案

extension NSAttributedString {

    func replaceHTMLTag(tag: String, withAttributes attributes: [String: AnyObject]) -> NSAttributedString {
        let openTag = "<\(tag)>"
        let closeTag = "</\(tag)>"

        let resultingText: NSMutableAttributedString = self.mutableCopy() as! NSMutableAttributedString
        while true {
            let plainString = resultingText.string as NSString
            let openTagRange = plainString.range(of: openTag)
            if openTagRange.length == 0 {
                break
            }

            let affectedLocation = openTagRange.location + openTagRange.length

            let searchRange = NSRange(location: affectedLocation, length: plainString.length - affectedLocation)

            let closeTagRange = plainString.range(of: closeTag, options: NSString.CompareOptions.init(rawValue: 0), range: searchRange)

            resultingText.setAttributes(attributes, range: NSRange(location: affectedLocation, length: closeTagRange.location - affectedLocation))
            resultingText.deleteCharacters(in: closeTagRange)
            resultingText.deleteCharacters(in: openTagRange)
        }
        return resultingText as NSAttributedString
    }
}