我将在这里展示一个示例，说明如何在Swift 4中将HTML转换为纯文本。

此示例模拟您收到以下内容：

WordPress&#8216房屋-->WordPress\'House

添加此扩展以将html代码转换为常规字符串：`

extension Data {
    var html2AttributedString: NSAttributedString? {
        do {
            return try NSAttributedString(data: self, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            print("error:", error)
            return  nil
        }
    }
    var html2String: String {
        return html2AttributedString?.string ?? ""
    }
}

extension String {
    var html2AttributedString: NSAttributedString? {
        return Data(utf8).html2AttributedString
    }
    var html2String: String {
        return html2AttributedString?.string ?? ""
    }
}

let htmlString = "WordPress&#8216House"

print("String is: ", textFromWP.html2String)