Layout constraints for custom UITtableViewCell not working - swift

Question

I'm creating custom UITableViewCells with a UILabel in each but can't get the label to display anywhere else than the top left corner of the cell, looks like this.
Constraints don't seem to be applied yet they're being called (reaching breakpoint). I tried to replace the UILabel by an UIImageView and apply the same constraints but nothing appears (i.e. table view cells are blank).
What am I missing?
View for cells:
import UIKit
class myTableViewCell: UITableViewCell {
override init(style: UITableViewCellStyle, reuseIdentifier: String!) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
setupViews()
}
required init?(coder decoder: NSCoder) {
super.init(coder: decoder)
}
let label: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.font = UIFont.systemFont(ofSize: 16, weight: UIFontWeightLight)
label.text = "Sample"
label.backgroundColor = UIColor.red
return label
}()
func setupViews () {
addSubview(label)
//add constraints
let marginsGuide = self.contentView.layoutMarginsGuide
label.leadingAnchor.constraint(equalTo: marginsGuide.leadingAnchor).isActive = true
label.trailingAnchor.constraint(equalTo: marginsGuide.trailingAnchor).isActive = true
label.topAnchor.constraint(equalTo: marginsGuide.topAnchor).isActive = true
label.bottomAnchor.constraint(equalTo: marginsGuide.bottomAnchor).isActive = true
}
}
View controller:
import UIKit
class myViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var myTableView: UITableView = UITableView()
var myArray = [Int]()
override func viewDidLoad() {
super.viewDidLoad()
//... do stuff incl. loading data into my myArray
let screenSize: CGRect = UIScreen.main.bounds
self.myTableView.frame = CGRect(x: 0, y: 0, width: screenSize.width, height: screenSize.height)
self.myTableView.delegate = self
self.myTableView.dataSource = self
self.myTableView.register(IngredientListTableViewCell.self, forCellReuseIdentifier: "cell")
self.view.addSubview(myTableView)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return myArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.myTableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! myTableViewCell
return cell
}
}

Answer 1

Change this
addSubview(label)
to this
contentView.addSubview(label)