swift UILabel不显示html标签

Table of Contents

    带html标签的文本srcText

    var attrStr = NSAttributedString(data: srcText.dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil, error: nil)
    

    label.attributedText = attrStr