Catalyst app with text field and button in stack view

//
//  ViewController.swift
//  Catalyst1
//
//  Created by Don Mag on 8/3/22.
//

import UIKit

class ViewController: UIViewController {

    let tf = UITextField()
    let infoLabel = UILabel()

    override func viewDidLoad() {
        super.viewDidLoad()

        let stackV = UIStackView()
        stackV.axis = .vertical
        stackV.spacing = 8
        stackV.backgroundColor = .blue
        stackV.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(stackV)

        let g = view.safeAreaLayoutGuide
        NSLayoutConstraint.activate([
            stackV.topAnchor.constraint(equalTo: g.topAnchor, constant: 40.0),
            stackV.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 40.0),
            stackV.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -40.0),
            //stackV.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: -40.0),
        ])

        tf.borderStyle = .roundedRect
        tf.text = "Text Field"
        stackV.addArrangedSubview(tf)

        let btn = UIButton()
        btn.setTitle("Tap Me", for: [])
        btn.setTitleColor(.white, for: .normal)
        btn.setTitleColor(.lightGray, for: .highlighted)
        btn.backgroundColor = .systemRed
        btn.addTarget(self, action: #selector(gotTap(_:)), for: .touchUpInside)
        stackV.addArrangedSubview(btn)

        infoLabel.backgroundColor = .cyan
        infoLabel.text = "Info:"
        infoLabel.font = .systemFont(ofSize: 32.0, weight: .light)
        infoLabel.numberOfLines = 0
        stackV.addArrangedSubview(infoLabel)

    }

    @objc func gotTap(_ sender: Any?) {
        let str = tf.text ?? "Empty"
        infoLabel.text = "Info: \(str)"
    }

}