ios - UITableViewAutomaticDimension 不调整到 UILabel 文本高度

Question

我有一个消息传递应用程序，并在气泡 View 的每一侧将标签约束设置为 8。我没有设置高度限制，我想弄清楚为什么滚动时标签在某些单元格上随机显示更多高度和错误大小:

    tableView.rowHeight = UITableViewAutomaticDimension
    tableView.estimatedRowHeight = 30

标签设置为行数 0 和自动换行。

    func configureCell(message: MessageCD) {

    self.message = message

    let username = message.getSender()?.username
    let text = message.text

    if username == UserDefaults.standard.value(forKey: USERNAME) as? String {

        senderLbl.text = text
        recipientBubbleView.isHidden = true
        senderBubbleView.isHidden = false
    } else {
        recipientLbl.text = text
        senderBubbleView.isHidden = true
        recipientBubbleView.isHidden = false
    }
}

我也尝试在设置标签后立即使用 sizeToFit() ，但这也不起作用。见附图。

Answer 1

Content Hugging Priority 解决了这个问题。

if msgUsername == UserDefaults.standard.value(forKey: USERNAME) as? String {

        recipientLbl.setContentHuggingPriority(250, for: UILayoutConstraintAxis.vertical)
        senderLbl.setContentHuggingPriority(750, for: UILayoutConstraintAxis.vertical)
        senderLbl.text = message.text
        senderLbl.sizeToFit()
        recipientUsernameLbl.isHidden = true
        recipientBubbleView.isHidden = true
        senderBubbleView.isHidden = false

    } else {

        senderLbl.setContentHuggingPriority(250, for: UILayoutConstraintAxis.vertical)
        recipientLbl.setContentHuggingPriority(750, for: UILayoutConstraintAxis.vertical)
        recipientLbl.text = message.text
        recipientUsernameLbl.text = msgUsername
        recipientUsernameLbl.isHidden = false
        recipientLbl.sizeToFit()
        senderBubbleView.isHidden = true
        recipientBubbleView.isHidden = false
    }