class BasicPickerVC: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    let picker = UIPickerView()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.addSubview(self.picker)

        // set frame near top-left
        picker.frame = .init(x: 60.0, y: 80.0, width: 240.0, height: 160.0)

        // we don't want any resizing o ndevice rotation
        picker.autoresizingMask = []

        // so we can see its frame
        picker.backgroundColor = .yellow

        self.picker.delegate = self
        self.picker.dataSource = self
    }

    override func viewSafeAreaInsetsDidChange() {
        super.viewSafeAreaInsetsDidChange()
        //This gets called everytime the device rotates, causing the picker view to redraw and reload all components. Trying to avoid this method being called.

        print ("viewSafeAreaInsetsDidChange")
        print (self.view.safeAreaInsets)
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        print("num components: 1")
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        print("num rows: 30")
        return 30
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        print("Title for Row:", row)
        return "Row: \(row)"
    }

}