查找在特定点的UILabel内容中是否有新行

Question

我正在开发一个项目，我在UITableViewCell中有一个UILabel，根据适合其UILabel（UITableViewAutomaticDimension）的内容排列其单元格大小.Hence，这个UITableView具有可扩展的可折叠单元格，因此我设置了如果我的单元格已折叠，则行数= 5。我的要求是如果第五行包含一个新行，则设置行数= 4。由于现在的这种复杂情况，如果它有一个新行，我在第五行得到一个空白区域。我的代码如下。

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        if indexPath.section == 0 {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell1", for: indexPath)

            let description = cell.viewWithTag(tableViewCellTags.namelabel) as! UILabel


            description.text = jsondata["text"] as! String
            description.sizeToFit()
            let seeMoreButton = cell.viewWithTag(tableViewCellTags.button) as! UIButton

            seeMoreButton.addTarget(self, action: #selector(self.seeMoreClicked(button:)), for: UIControlEvents.touchDown)
            cell.setNeedsUpdateConstraints()
            cell.updateConstraintsIfNeeded()

            description.numberOfLines = isHealerDetailCollapsed ? 5 : 0


            loadTheInitialLabelText(descriptionContentLbl: description, descriptionSeeMoreBtn: seeMoreButton)
        return cell
        }else {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)

        return cell
        }
    }

    func loadTheInitialLabelText(descriptionContentLbl:UILabel,descriptionSeeMoreBtn:UIButton) {
        let DescriptionTextheight = descriptionContentLbl.text?.height(withConstrainedWidth: descriptionContentLbl.frame.width, font: descriptionContentLbl.font)
        //let hac = "nednkewnlkednkewnklew".components(separatedBy: "")

       // descriptionContentLbl.text
        if descriptionContentLbl.intrinsicContentSize.height < DescriptionTextheight! {
            descriptionSeeMoreBtn.isHidden = false
        }else{
            if(isSeemoreVisible){
                descriptionSeeMoreBtn.isHidden = true
            }
        }
    }
}

extension String {

    func height(withConstrainedWidth width: CGFloat, font: UIFont) -> CGFloat {
        let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)
        let boundingBox = self.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSFontAttributeName: font], context: nil)

        return boundingBox.height
    }
}