在UITextView中显示HTML文本崩溃发生在swift 4中？

var htmlToAttributedString: NSAttributedString? {
    guard let data = data(using: .utf8) else { return NSAttributedString() }
    do {
        return try NSAttributedString(data: data,options: [.documentType: NSAttributedString.DocumentType.html,.characterEncoding:String.Encoding.utf8.rawValue],documentAttributes: nil) // Get crash on this line
    } catch let error {
        print(error.localizedDescription)
        return NSAttributedString()
    }
}

var htmlToString: String {
    return htmlToAttributedString?.string ?? ""
}

在UITableViewCell中显示HTML文本

cell.textViewMessage.attributedText = msg.htmlToAttributedString

第一次启动没有崩溃,但在那之后,当我运行代码时崩溃并且之后没有工作.

Thread 1: EXC_BAD_ACCESS (code=1,address=0x10)

#Edit HTML要在单元格中显示的字符串

<p>Here's a short video tour.  Press play to start.</p><br><iframe class="ql-video" frameborder="0" allowfullscreen="true" src="https://www.youtube.com"></iframe><br>

#Edit 1 – 我试图在Playground中运行此代码并且它正常工作,除非它现在显示错误.请参阅附图