UIStackView content hugging is not working as expected in UITableViewCell - ios

Question

I have two vertical StackView nested in horizontal StackView. For the first one:
titlesView.axis = .vertical
titlesView.distribution = .fill
titlesView.alignment = .leading
And the second one:
checkView.axis = .vertical
checkView.distribution = .fil
checkView.alignment = .center
and for holderStackView(root)
holderStackView.axis = .horizontal
holderStackView.alignment = .center
holderStackView.distribution = .fill
holderStackView.addArrangedSubview(titlesView)
holderStackView.addArrangedSubview(checkView)
titlesView.setContentHuggingPriority(.defaultLow, for: .horizontal)
checkView.setContentHuggingPriority(.defaultHigh, for: .horizontal)
I expect the titlesView must fill the StackView, but the checkView StackView fills the holderStackView stack view.
if I set alignment for both of them center or leading, then it works as expected and the first one grows.
Expectation:
Reality:
How can I fix this problem?
It happens only in the contentView of the UITableViewCell, see the minimal example below:
class ViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.separatorColor = UIColor(red:0.87, green:0.87, blue:0.87, alpha:1.00)
tableView.estimatedRowHeight = 150
tableView.backgroundColor = UIColor.clear
tableView.rowHeight = UITableViewAutomaticDimension
self.view.backgroundColor = UIColor(red:0.93, green:0.93, blue:0.93, alpha:1.00)
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 6
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
return MedicationHomeCell()
}
}
class MedicationHomeCell: UITableViewCell {
let holderStackView = UIStackView()
let checkView = UIStackView()
let titlesView = UIStackView()
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
layoutViews()
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
layoutViews()
}
func layoutViews() {
self.contentView.backgroundColor = .white
self.contentView.addSubview(holderStackView)
holderStackView.addArrangedSubview(titlesView)
holderStackView.addArrangedSubview(checkView)
titlesView.axis = .vertical
titlesView.distribution = .fill
titlesView.alignment = .leading
checkView.axis = .vertical
checkView.distribution = .fill
checkView.alignment = .center
holderStackView.axis = .horizontal
holderStackView.alignment = .center
holderStackView.distribution = .fill
titlesView.setContentHuggingPriority(.defaultLow, for: .horizontal)
checkView.setContentHuggingPriority(.defaultHigh, for: .horizontal)
holderStackView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
holderStackView.leftAnchor.constraint(equalTo: self.contentView.leftAnchor),
holderStackView.rightAnchor.constraint(equalTo: self.contentView.rightAnchor),
holderStackView.topAnchor.constraint(equalTo: self.contentView.topAnchor),
holderStackView.bottomAnchor.constraint(equalTo: self.contentView.bottomAnchor)
])
for index in 0..<2 {
let label = UILabel()
label.text = "Label \(index)"
label.backgroundColor = .red
titlesView.addArrangedSubview(label)
}
for index in 0..<2 {
let label = UILabel()
label.text = "Text \(index)"
label.backgroundColor = .green
checkView.addArrangedSubview(label)
}
}
}

Answer 1

UIStackViews don't seem to respect the content hugging and resistance compression properties. Instead, set these properties on each arranged subview.
For nested stack views, you may need to drill down to their non-stack arranged subviews, and set the properties there.