Get Data from Date Picker

General Discussion
2

UIDatePicker uses the target-action pattern, so when you create one, you have to use addTarget(_:action:for:) to assign one of your functions that will get called.

So if you have this function:

@objc
private func userSelectedDate(_ sender: UIDatePicker) {
    //sender.date would contain the date selected by the user
}

you would set it up like this:

//I use ViewController here but you would use whatever
//your UIViewController is actually named
datePicker.addTarget(self, 
                     action: #selector(ViewController.userSelectedDate), 
                     for: .valueChanged)