给UILable中的文字添加删除线样式

let attributedText = NSAttributedString(string: "内容", attributes: [NSStrikethroughStyleAttributeName: 1])
let contentLabel = UILabel()
contentLabel.attributedText = attributedText

//        let attr = NSMutableAttributedString(string: content!)
//        attr.addAttribute(NSStrikethroughStyleAttributeName, value: NSNumber(integer: 1), range: NSMakeRange(0, 1))
//        titleLabel.attributedText = attr
//        titleLabel.sizeToFit()