class ParentVC: UIViewController {
	
	override func viewDidLoad() {
		super.viewDidLoad()
		view.backgroundColor = .systemYellow

		let childVC = ChildVC()
		self.addChild(childVC)
		childVC.view.frame = .init(x: 60.0, y: 80.0, width: 240.0, height: 160.0)
		childVC.view.autoresizingMask = []
		self.view.addSubview(childVC.view)
		childVC.didMove(toParent: self)
	}
	
}

class ChildVC: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
	
	let picker = UIPickerView()
	
	override func viewDidLoad() {
		super.viewDidLoad()
		
		self.view.addSubview(self.picker)
		
		self.picker.delegate = self
		self.picker.dataSource = self

	}
	
	override func viewDidAppear(_ animated: Bool) {
		print(#function)
		super.viewDidAppear(animated)
		
		if self.view.superview != nil {
			picker.frame = self.view.bounds
			picker.autoresizingMask = []
		} else {
			picker.frame = .init(x: 20.0, y: 100.0, width: 260.0, height: 160.0)
		}

		picker.backgroundColor = .yellow
	}
	
	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(#function)
		return 1
	}
	
	func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
		print(#function)
		return 30
	}
	
	func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
		print(#function, "Row:", row)
		return "Row: \(row)"
	}
	
}