MainViewWorking.swift

import UIKit

private func stopScrolling(in view: UIView) {
    if let scrollView = view as? UIScrollView {
        scrollView.setContentOffset(scrollView.contentOffset, animated: false)
    }
    for subview in view.subviews {
        stopScrolling(in: subview)
    }
}


class MainView: UIView {
    private let datePicker = UIDatePicker()
    private let resetTimeButton = UIButton(type: .system)
    private let date = Date()
    
    init() {
        super.init(frame: .zero)
        datePicker.preferredDatePickerStyle = .wheels
        datePicker.date = date
        addSubview(datePicker)
        datePicker.translatesAutoresizingMaskIntoConstraints = false
        datePicker.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
        datePicker.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
        
        resetTimeButton.setTitle("Reset time", for: .normal)
        addSubview(resetTimeButton)
        resetTimeButton.translatesAutoresizingMaskIntoConstraints = false
        resetTimeButton.centerYAnchor.constraint(equalTo: datePicker.bottomAnchor, constant: 20).isActive = true
        resetTimeButton.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -50).isActive = true
        
        resetTimeButton.addTarget(self, action: #selector(resetTime), for: .touchUpInside)
    }
    
    @objc private func resetTime() {
        let randomNanoseconds = Int.random(in: 0..<1_000_000_000)
        let dateWithRandomNanoseconds = Calendar.current.date(bySetting: .nanosecond, value: randomNanoseconds, of: date) ?? date
        datePicker.date = dateWithRandomNanoseconds
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

class MainViewController: UIViewController {
    override func loadView() {
        view = MainView()
    }
    
    override func viewDidLoad() {
    }
}