Updating Constraints in UITableViewCell are not properly - ios

Question

I want to make a dynamic cell in my UITableView in case of image height. Everything works properly, but when I scroll my UITableView, debugger is yelling me about bad constraints in my cell, but cells look exactly what I want. I can't be calm when I see this debug info ;)
My CustomCell class looks like that:
class CustomCell: UITableViewCell {
//MARK: - Outlets
#IBOutlet weak var photoImageView: UIImageView!
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var heightConstraint: NSLayoutConstraint!
//MARK: - Variables
var dream: MyDream? {
didSet {
if let item = dream, let image = UIImage(data: item.photoData) {
scaleImageView(image: image)
photoImageView.image = image
titleLabel.text = item.title
}
}
}
func scaleImageView(image: UIImage) {
let imageWidth = image.size.width
let imageScale = image.size.height / image.size.width
if imageWidth > photoImageView.bounds.width {
heightConstraint.constant = photoImageView.bounds.size.width * imageScale
} else {
heightConstraint.constant = imageWidth * imageScale
}
}
}
my cell in .xib looks like that:
TitleLabel doesn't have a height constraint. Leading, Top, Trailing, Bottom only.
and my ViewController is quite simple and looks like that:
class ViewController: UIViewController {
//MARK: - Outlets
#IBOutlet var tableView: UITableView!
//MARK: - Variables
lazy var dreams = [MyDream]()
override func viewDidLoad() {
super.viewDidLoad()
createModel() // I mock data here :)
setTableView()
}
func setTableView() {
tableView.delegate = self
tableView.dataSource = self
tableView.estimatedRowHeight = 100
tableView.rowHeight = UITableViewAutomaticDimension
tableView.register(UINib(nibName: String(describing: CustomCell.self), bundle: nil), forCellReuseIdentifier: "cell")
}
func createModel() {
for i in 0..<12 {
if i < 6 {
if let image = UIImage(named: "\(i + 1)"), let imageData = UIImageJPEGRepresentation(image, 100) {
let dream = MyDream(photoData: imageData, title: "Image number \(i + 1)")
dreams.append(dream)
}
} else {
if let image = UIImage(named: "\(i - 5)"), let imageData = UIImageJPEGRepresentation(image, 100) {
let dream = MyDream(photoData: imageData, title: "Image number \(i + 1)")
dreams.append(dream)
}
}
}
}
}
extension ViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dreams.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CustomCell
cell.dream = dreams[indexPath.row]
cell.selectionStyle = .none
return cell
}
}
How it looks like in simulator:
every thing look fine, but console gives me this kind of error:
I don't know why? I tried to use layoutIfNeeded(), updateConstraints() and setNeedsLayout() in didSet in CustomCell but is doesn't help. Any suggestions?

Answer 1

I guess you're having some redundant constraints on your image.
They could be height / bottom / top constraints. One should be removed