Hiding a view inside stackview still keeps constraints active - swift

Question

This code can be copy paste inside a newly created project:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let label = createLabel()
let imageView = createImageView()
let stackView = UIStackView(arrangedSubviews: [imageView, label])
stackView.axis = .vertical
stackView.spacing = 5
view.addSubview(stackView)
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
Timer.scheduledTimer(withTimeInterval: 1, repeats: false) { (_) in
imageView.isHidden = true
}
}
func createLabel() -> UILabel {
let label = UILabel(frame: .zero)
label.text = "Some Text"
label.setContentHuggingPriority(.required, for: .horizontal)
label.setContentHuggingPriority(.required, for: .vertical)
label.backgroundColor = .green
return label
}
func createImageView() -> UIImageView {
let imageView = UIImageView()
imageView.backgroundColor = .red
imageView.heightAnchor.constraint(equalToConstant: 200).isActive = true
imageView.heightAnchor.constraint(equalTo: imageView.widthAnchor).isActive = true
return imageView
}
}
It is a UILabel and a UIImageView inside a UIStackView. When I hide the UIImageView, I see that the UIStackView correctly adapts itselfs to the UILabel's height. However, the UIStackView does not adapts itself to the width of the UILabel.
How can I make the UIStackView resize itself to it's only visible views/UILabel? I made a variabele constraint for the UIImageView's height anchor constant and turning that off when hiding the UIImageView, but than the UILabel disappears for some odd reason.

Answer 1

Add stackview alignment
This property determines how the stack view lays out its arranged
views perpendicularly to its axis. The default value is
UIStackView.Alignment.fill.
stackView.alignment = .leading
Stackview resizes itself to it's only visible UILabel

Answer 2

Try changing the Distribution to Fill Equally in the UIStackView's Attribute Inspector and the Alignment to Fill or to center as you like it to be.