Various UIKit controls which interact with each other and are created programmatically.

HomeViewController.swift

import UIKit

class HomeViewController: UIViewController {
    
    var textField: UITextFieldPadded = {
        let textField = UITextFieldPadded()
        textField.translatesAutoresizingMaskIntoConstraints = false
        textField.placeholder = "Enter some text here"
        return textField }()

    var label: UILabelPadded = {
        let label = UILabelPadded()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.backgroundColor = .systemBackground
        label.text = "This is a label."
        label.adjustsFontForContentSizeCategory = true
        label.numberOfLines = 0
        return label }()
    
    var slider: UISlider = {
        let slider = UISlider()
        slider.translatesAutoresizingMaskIntoConstraints = false
        slider.backgroundColor = .systemGray
        slider.maximumValue = 100
        slider.minimumValue = 0
        slider.accessibilityIdentifier = "Completion"
        return slider }()
    
    var progressView: UIProgressView = {
        let progressView = UIProgressView()
        progressView.translatesAutoresizingMaskIntoConstraints = false
        progressView.backgroundColor = .systemMint
        progressView.progressTintColor = .systemRed
        return progressView }()
    
    var segment: UISegmentedControl = {
        let segment = UISegmentedControl()
        segment.translatesAutoresizingMaskIntoConstraints = false
        segment.insertSegment(withTitle: "Omega", at: 0, animated: true)
        segment.insertSegment(withTitle: "Alpha", at: 0, animated: true)
        segment.selectedSegmentIndex = 0
        return segment }()
    
    var stack: UIStackView = {
        let stack = UIStackView()
        stack.translatesAutoresizingMaskIntoConstraints = false
        stack.backgroundColor = .systemOrange
        stack.alignment = .center
        stack.layer.cornerRadius = 12
        stack.layer.masksToBounds = true
        
        let redButton = UIButton()
        redButton.configuration = .plain()
        redButton.backgroundColor = .systemRed
        redButton.setTitleColor(.black, for: .normal)
        redButton.setTitle("Red", for: .normal)
        
        let greenButton = UIButton()
        greenButton.configuration = .plain()
        greenButton.backgroundColor = .systemGreen
        greenButton.setTitleColor(.black, for: .normal)
        greenButton.setTitle("Green", for: .normal)
        
        let blueButton = UIButton()
        blueButton.configuration = .plain()
        blueButton.backgroundColor = .systemBlue
        blueButton.setTitleColor(.black, for: .normal)
        blueButton.setTitle("Blue", for: .normal)
        
        stack.addArrangedSubview(redButton)
        stack.addArrangedSubview(greenButton)
        stack.addArrangedSubview(blueButton)
        
        return stack }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .secondarySystemBackground
        
        view.addSubview(textField)
        view.addSubview(label)
        view.addSubview(slider)
        view.addSubview(progressView)
        view.addSubview(segment)
        view.addSubview(stack)
        
        self.title = "Alpha"

        configure()
        
    }
    
    func segmentChange(_ sender: UISegmentedControl) {
        title = segment.titleForSegment(at: segment.selectedSegmentIndex)
    }
    
    @objc func textChanged(_ sender: UITextField) {
        label.text = textField.text
    }
    
    @objc func sliderDragged(_ sender: UISlider) {
        let progress =   ( sender.maximumValue / sender.maximumValue ) - ( sender.value / sender.maximumValue )
        progressView.setProgress(progress, animated: true)
    }

    @objc func stackButtonTapped(_ sender: UIButton) {
        
        let alert = UIAlertController(title: sender.currentTitle, message: nil, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default))
        present(alert, animated: true)
        
    }
    
    @objc func colorSelected(_ sender: UIButton) {
        let alert = UIAlertController(title: sender.titleLabel?.text, message: nil, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default))
        present(alert, animated: true)
    }
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

    func configure() {
        
        textField.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
        textField.leadingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.leadingAnchor,
                                           constant: self.view.bounds.width / 10).isActive = true
        textField.trailingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.trailingAnchor,
                                            constant: -(self.view.bounds.width / 10)).isActive = true
        textField.addTarget(self, action: #selector(textChanged(_:)), for: .allEditingEvents)
        
        label.topAnchor.constraint(equalTo: textField.bottomAnchor, constant: 50).isActive = true
        label.leadingAnchor.constraint(equalTo: textField.leadingAnchor).isActive = true
        label.trailingAnchor.constraint(equalTo: textField.trailingAnchor).isActive = true
        label.heightAnchor.constraint(equalTo: textField.heightAnchor).isActive = true
        
        slider.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 50).isActive = true
        slider.leadingAnchor.constraint(equalTo: textField.leadingAnchor).isActive = true
        slider.trailingAnchor.constraint(equalTo: textField.trailingAnchor).isActive = true
        slider.addTarget(self, action: #selector(sliderDragged(_:)), for: .touchDragInside)
        
        progressView.topAnchor.constraint(equalTo: slider.bottomAnchor, constant: 50).isActive = true
        progressView.leadingAnchor.constraint(equalTo: textField.leadingAnchor).isActive = true
        progressView.trailingAnchor.constraint(equalTo: textField.trailingAnchor).isActive = true
        progressView.heightAnchor.constraint(equalTo: slider.heightAnchor).isActive = true
        progressView.progress = ((slider.maximumValue / slider.value ) / slider.maximumValue)
        
        segment.topAnchor.constraint(equalTo: progressView.bottomAnchor, constant: 50).isActive = true
        segment.leadingAnchor.constraint(equalTo: textField.leadingAnchor).isActive = true
        segment.trailingAnchor.constraint(equalTo: textField.trailingAnchor).isActive = true
        segment.addTarget(self, action: #selector(handleSegment(_:)), for: .valueChanged)
        
        stack.topAnchor.constraint(equalTo: segment.bottomAnchor, constant: 50).isActive = true
        stack.leadingAnchor.constraint(equalTo: textField.leadingAnchor).isActive = true
        stack.trailingAnchor.constraint(equalTo: textField.trailingAnchor).isActive = true
        
        for sub in stack.arrangedSubviews {
            if sub is UIButton {
                let button = sub as? UIButton
                button?.addTarget(self, action: #selector(stackButtonTapped(_:)), for: .touchUpInside)
            }
            
        }
        
    }
    
    @objc func handleSegment(_ sender: UISegmentedControl) {
        self.title = sender.titleForSegment(at: sender.selectedSegmentIndex)
        
    }
    
}