UILabel in UIStackView

Question

While I put a single UILabel into the stack of UIStackView, everything works fine as expected. But what I need is to actually put a UIView under the UILabel and keep the self-size of UILabel to be kept. I just wondering, is there is a way to achieve this without using UITableView and self-sized cell? I used this code

let textLabel = UILabel()
    textLabel.text = "zaciatok TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT koniec"
    textLabel.numberOfLines = 0
    textLabel.sizeToFit()
    textLabel.backgroundColor = .yellow
    let testItemView = UIView()
    testItemView.backgroundColor = .green
    testItemView.addSubview(textLabel)
    mainStackView.addArrangedSubview(testItemView)

but it shows the text with only one line which is not making the thing I need.

I have tried the new suggestion with the code

mainStackView.distribution = .fill
    let textLabel = UILabel()
    textLabel.text = "zaciatok TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT koniec"
    textLabel.numberOfLines = 0
    textLabel.sizeToFit()
    textLabel.backgroundColor = .yellow
    let testItemView = UIView()

    testItemView.backgroundColor = .green
    testItemView.addSubview(textLabel)

    mainStackView.addArrangedSubview(testItemView)
    testItemView.translatesAutoresizingMaskIntoConstraints = false
    testItemView.heightAnchor.constraint(equalToConstant: 50).isActive = true

I get

when I remove sizeToFit, there is no label at all My constraints of stackview:

Answer 1

Try this

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = .white

        let mainStackView = UIStackView()
        mainStackView.axis = .vertical
        mainStackView.spacing = 3
        mainStackView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(mainStackView)

        mainStackView.topAnchor.constraint(equalTo: view.topAnchor, constant: 100).isActive = true
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-(10)-[mainStackView]-(10)-|", options: [], metrics: nil, views: ["mainStackView":mainStackView]))

        let testItemView = UIView()
        testItemView.layer.maskedCorners = [.layerMinXMinYCorner,.layerMinXMaxYCorner,.layerMaxXMinYCorner]
        testItemView.layer.cornerRadius = 15.0
        testItemView.layer.masksToBounds = true
        testItemView.backgroundColor = .green
        testItemView.translatesAutoresizingMaskIntoConstraints = false

        let textLabel = UILabel()
        textLabel.translatesAutoresizingMaskIntoConstraints = false
        textLabel.text = "zaciatok TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT TEXT TEXTTEXT TEXT koniec"
        textLabel.numberOfLines = 0
        textLabel.lineBreakMode = .byWordWrapping
        textLabel.backgroundColor = .yellow
        testItemView.addSubview(textLabel)

        testItemView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-(5)-[textLabel(>=30)]-(5)-|", options: [], metrics: nil, views: ["textLabel":textLabel]))
        testItemView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-(5)-[textLabel]-(5)-|", options: [], metrics: nil, views: ["textLabel":textLabel]))

        mainStackView.addArrangedSubview(testItemView)
    }
}

Answer 2

1- For the text inside the label to wrap , mainStackView must be hooked properly with leading & trailing constraints ( sure also with top & bottom for automatic sizing )

2- You need to remove

textLabel.sizeToFit()

3- The view you add has no intrinsic content size like the label , so you need to give it a static height constraint

let testItemView = UIView()
testItemView.translatesAutoresizingMaskIntoConstraints = false
testItemView.heightAnchor.constraint(equalToConstant: 50).isActive = true

4- Set

mainStackView.distribution = .fill