Adding images to table view cell problem using stack views - swift

Question

in my prototype cell I have a horizontal stack view and I connected that to my UITableViewCell and I defined an update function In my UITableViewCell that adds multiple images to the stack view and I called the function In TableViewController cellForRowAt but nothing nothing happens.
//inside UITableViewCell
#IBOutlet weak var lineStack: UIStackView!
func update(_ imageName: String){
let numberOfCopies = Int(deviceWidth/50)
let startX = (Int(deviceWidth) - (numberOfCopies*50))/2
xValue = xValue + startX
let image = UIImage(named: imageName)
for _ in 1...Int(numberOfCopies) {
xValue = xValue + heightValue
let imageView = UIImageView(image: image)
imageView.frame = CGRect(x: xValue , y: 0, width: widthValue, height: heightValue)
lineStack.addSubview(imageView)
}
}
//inside TableViewController
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Line", for: indexPath) as! LineTableViewCell
let imageName = imagesName[indexPath.row]
cell.update(imageName)
return cell
}

Answer 1

Your post indicates you want your images to be 50 x 50 points... use auto-layout constraints with .addArrangedSubview():
class TestCell: UITableViewCell {
#IBOutlet var lineStack: UIStackView!
func update(_ imageName: String) {
let numberOfCopies = Int(deviceWidth/50)
let image = UIImage(named: imageName)
for _ in 1...Int(numberOfCopies) {
let imageView = UIImageView(image: image)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.widthAnchor.constraint(equalToConstant: 50).isActive = true
imageView.heightAnchor.constraint(equalTo: imageView.widthAnchor).isActive = true
lineStack.addArrangedSubview(imageView)
}
}
}
EDIT Sample result, with stack view centered horizontally:
Stack view is set to:
Axis: Horizontal
Alignment: Fill
Distribution: Fill
Spacing: 0
and this is the layout with constraints:
Note that the stack view has a Width constraint of 10, but its Priority is 250 ... that allows the stack view to stretch horizontally, while keeping IB satisfied with the constraints.

Answer 2

For the line:
lineStack.addSubview(imageView)
Instead of addSubview() you need to do it with addArrangedSubview(). The former is the regular way of adding a subview to a view, whereas the latter is specifically for UIStackView and tells the view to insert it properly.