Custom UIView Class Constraints Depending on ParentView - ios

Question

I'm making a custom UIView class that hold a datepicker. I want to setup the view constraints to reference the parent view that will call my custom class. here is my following code. this is what i get
Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
class CustomView: UIView {
var datepicker:UIDatePicker!
override init(frame: CGRect) {
super.init(frame: frame)
setupConstraints()
} // initiliaze the button like this CustomButton()
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
func setupDatePicker() {
let datepicker = UIDatePicker()
datepicker.minimumDate = Date()
}
func setupConstraints(){
setupDatePicker()
translatesAutoresizingMaskIntoConstraints = false
leadingAnchor.constraint(equalTo: superview!.leadingAnchor, constant: 20).isActive = true // the error occurs here
trailingAnchor.constraint(equalTo: superview!.trailingAnchor, constant: -20).isActive = true
heightAnchor.constraint(equalToConstant: 60).isActive = true
centerYAnchor.constraint(equalTo: superview!.centerYAnchor).isActive = true
backgroundColor = .red
addSubview(datepicker)
datepicker.translatesAutoresizingMaskIntoConstraints = false
datepicker.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 10).isActive = true
datepicker.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -10).isActive = true
datepicker.heightAnchor.constraint(equalToConstant: 50).isActive = true
datepicker.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
}
}
and this is where i create my custom view and launch it
var customView: CustomView!
class ListViewController: UIViewController {
#IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
customView = CustomView()
view.addSubview(customView)
view.bringSubviewToFront(customView)
Thank you for your time.

Answer 1

You're not assigning var datepicker:UIDatePicker! so it is nil.
Try:
func setupDatePicker() {
let datepicker = UIDatePicker()
datepicker.minimumDate = Date()
self.datepicker = datepicker
}