Images not being rounded in UIStackView - swift

Question

I'm trying to round several images and add them in a stack view, for some reason it's not working. Basically, I have an array with all UIImage names and assign them to a UIImageView. When I try to make a circle out of the image, it's not working :
var navStackView : UIStackView = {
let stack = UIStackView()
stack.axis = .horizontal
stack.alignment = .center
stack.distribution = .fillEqually
// stack.spacing = -10
stack.translatesAutoresizingMaskIntoConstraints = false
return stack
}()
var images = ["1", "2", "3", "4"]
override func viewDidLoad() {
super.viewDidLoad()
let navController = navigationController!
navController.navigationBar.addSubview(navStackView)
// x, y, w, h
navStackView.leadingAnchor.constraint(equalTo: navController.navigationBar.leadingAnchor).isActive = true
navStackView.trailingAnchor.constraint(equalTo: navController.navigationBar.trailingAnchor).isActive = true
navStackView.topAnchor.constraint(equalTo: navController.navigationBar.topAnchor).isActive = true
navStackView.bottomAnchor.constraint(equalTo: navController.navigationBar.bottomAnchor).isActive = true
for image in images {
let imageView = UIImageView()
imageView.image = UIImage(named: image)
imageView.layer.cornerRadius = imageView.frame.height / 2
imageView.clipsToBounds = true
imageView.layer.masksToBounds = false
imageView.contentMode = .scaleAspectFit
// imageView.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
navStackView.addArrangedSubview(imageView)
navStackView.layoutIfNeeded()
}
navigationItem.titleView = navStackView
}

Answer 1

You can try
var once = true
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if once {
navStackView.subviews.forEach { $0.layer.cornerRadius = $0.frame.height / 2 }
once = false
}
}