UITableView dynamic cell heights only correct after some scrolling

Question

I have a UITableView with a custom UITableViewCell defined in a storyboard using auto layout. The cell has several multiline UILabels.

Answer 1

In Swift 3. I had to call self.layoutIfNeeded() each time I update the text of the reusable cell.

import UIKit
import SnapKit

class CommentTableViewCell: UITableViewCell {

    static let reuseIdentifier = "CommentTableViewCell"

    var comment: Comment! {
        didSet {
            textLbl.attributedText = comment.attributedTextToDisplay()
            self.layoutIfNeeded() //This is a fix to make propper automatic dimentions (height).
        }
    }

    internal var textLbl = UILabel()

    override func layoutSubviews() {
        super.layoutSubviews()

        if textLbl.superview == nil {
            textLbl.numberOfLines = 0
            textLbl.lineBreakMode = .byWordWrapping
            self.contentView.addSubview(textLbl)
            textLbl.snp.makeConstraints({ (make) in
                make.left.equalTo(contentView.snp.left).inset(10)
                make.right.equalTo(contentView.snp.right).inset(10)
                make.top.equalTo(contentView.snp.top).inset(10)
                make.bottom.equalTo(contentView.snp.bottom).inset(10)
            })
        }
    }
}

---

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let comment = comments[indexPath.row]
        let cell = tableView.dequeueReusableCell(withIdentifier: CommentTableViewCell.reuseIdentifier, for: indexPath) as! CommentTableViewCell
        cell.selectionStyle = .none
        cell.comment = comment
        return cell
    }

---

commentsTableView.rowHeight = UITableViewAutomaticDimension
    commentsTableView.estimatedRowHeight = 140