I’m trying to build a layout in swift using this idea: scroll -> uistackview (vertical) -> UIstackView (horizontal) -> UIstackview (vertical) [ view + n(UIStackview (horizontal)-> UIStackview (vertical) -> view + n Stackview ….)] i work until the second level but after that, all the views are displayed with frame 0 examples of implementation:

am I doing something wrong?
`
import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    let scroll = UIScrollView()
    scroll.backgroundColor = .blue
    view.addSubview(scroll)
    scroll.translatesAutoresizingMaskIntoConstraints = false
    scroll.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
    scroll.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    scroll.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    scroll.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true

    
    let stackV = UIStackView()
    stackV.axis = .vertical
    stackV.backgroundColor = .red
    stackV.translatesAutoresizingMaskIntoConstraints = false
    scroll.addSubview(stackV)
    
    stackV.topAnchor.constraint(equalTo: scroll.topAnchor).isActive = true
    stackV.bottomAnchor.constraint(equalTo: scroll.bottomAnchor).isActive = true
    stackV.leadingAnchor.constraint(equalTo: scroll.leadingAnchor).isActive = true
    stackV.trailingAnchor.constraint(equalTo: scroll.trailingAnchor).isActive = true
    stackV.addArrangedSubview(UIView())

    var stackH: UIStackView
    for j in (0...3) {
        stackH = UIStackView()
        stackH.axis = .horizontal
        stackH.backgroundColor = .green
        stackH.translatesAutoresizingMaskIntoConstraints = false
        
        stackV.addArrangedSubview(stackH)
        
        stackH.leadingAnchor.constraint(equalTo: stackV.leadingAnchor).isActive = true
        stackH.trailingAnchor.constraint(equalTo: stackV.trailingAnchor).isActive = true

        var label: UILabel
        var stackCol: UIStackView
        for i in (0...3) {
            stackCol = UIStackView()
            stackCol.axis = .vertical
            stackCol.backgroundColor = .cyan
            stackCol.spacing = 4
            stackCol.translatesAutoresizingMaskIntoConstraints = false
            stackH.addArrangedSubview(stackCol)
            stackH.addArrangedSubview(UIView())


            stackCol.leadingAnchor.constraint(equalTo: stackH.leadingAnchor).isActive = true
            stackCol.trailingAnchor.constraint(equalTo: stackH.trailingAnchor).isActive = true

            label = UILabel()
            label.translatesAutoresizingMaskIntoConstraints = false
            
            label.text = "teste cacetas"
            label.backgroundColor = .orange
            
            label.heightAnchor.constraint(equalToConstant: 30).isActive = true
            label.widthAnchor.constraint(equalToConstant: 30).isActive = true

            stackCol.addArrangedSubview(label)
            stackCol.addArrangedSubview(UIView())
            label.leadingAnchor.constraint(equalTo: stackCol.leadingAnchor).isActive = true
            label.trailingAnchor.constraint(equalTo: stackCol.trailingAnchor).isActive = true
            stackCol.layoutIfNeeded()
            
        }
    }
    
}

}
`

I tried lots of different, constrains configurations but it not work