ios - 如何自动计算tableview单元格高度和标签高度

Question

对不起，我是swift的初学者。我想获得聊天气泡 View ，但我无法使它整洁。
如何让tableviewcell自动更新高度
非常感谢!

Viewcontroller.swift

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    let content = contents[indexPath.row] as Message
    let contentWidth:CGFloat = UIScreen.main.bounds.width*0.590
    let label:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: contentWidth, height: CGFloat.greatestFiniteMagnitude))
    label.numberOfLines = 0
    label.font = fontTalkContent
    label.text = content.content
    label.sizeToFit()
    var uiHeight:CGFloat = (label.frame.height <= defaultChatroomIconHeight) ? defaultContentHeight : label.frame.height

}

class ChatContentTableViewCell: UITableViewCell {
var labelContent:UILabel = { ()->UILabel in
    let ui:UILabel = ChatContent()
    ui.font = defaultTextFont
    ui.numberOfLines = 0
    ui.lineBreakMode = NSLineBreakMode.byWordWrapping
    ui.layer.cornerRadius = dafaultLabelContentRadius
    ui.layer.masksToBounds = true
    ui.isHidden = false
    return ui
}()

override func layoutSubviews()
{
    super.layoutSubviews()
     bulidLoad()

}
func bulidload() {

    labelContent.frame = CGRect(x: 0, y: 0, width: contentWidth, height: CGFloat.greatestFiniteMagnitude)

    labelContent.sizeToFit()

    addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[labelContent]-padding-[icon]-padding-|", options: [], metrics: metrics, views: views))
            addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[labelDatetime]-padding-[icon]-padding-|", options: [], metrics: metrics, views: views))
            addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-topPadding-[labelContent]-contentAndDatePadding-[labelDatetime]-dateAndBottomPaddding-|", options: [], metrics: metrics, views: views))
            addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-topPadding-[icon]", options: [], metrics: metrics, views: views))
}
}

class ChatContent:UILabel {
override init(frame: CGRect) {
    super.init(frame:frame)
    translatesAutoresizingMaskIntoConstraints = false
    numberOfLines = 0
    isUserInteractionEnabled = true
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func drawText(in rect: CGRect) {
    let insets: UIEdgeInsets = UIEdgeInsets(top: defaultContentPadding, left: defaultPadding, bottom: defaultContentPadding, right: defaultPadding)

    super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
}

Answer 1

使用 UITableViewAutomaticDimension

 func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
    }