如何从所选日期开始在UIDatePicker中结束日期i在ios中开始日期？

Question

我有两个文本字段，在这两个文本字段中显示了开始日期和结束日期。所以为此我使用的是UIDatePicker。因此，如果我在开始日期选择例如10/7/2018的日期，并且如果我转到结束日期文本字段，那么UIDatepicker应该是从10/07/2018或更多的日期，即不再允许以前的日期。 这是我的代码：

  import UIKit
protocol USTDatePickerTableViewCellDelegate {

    func updateSelectedDate(date : Date ,selectedPicker : String)
}

class USTDatePickerTableViewCell: UITableViewCell {


    @IBOutlet weak var datePicker : UIDatePicker!
    @IBOutlet weak var separatorView : UIView!

    var delegate : USTDatePickerTableViewCellDelegate!
    var selectedPicker : String!

    override func awakeFromNib() {
        super.awakeFromNib()
        datePicker.datePickerMode = .date
        datePicker.minuteInterval = 5
        let calendar = Calendar.current
        var minDateComponent = calendar.dateComponents([.day,.month,.year], from: Date())
        minDateComponent.day = 01
        minDateComponent.month = 01
        minDateComponent.year = 1950
        let minDate = calendar.date(from: minDateComponent)
        datePicker.minimumDate = minDate! as Date
        datePicker.maximumDate = Date()
        datePicker.addTarget(self, action: #selector(dateChanged(_:)), for: .valueChanged)
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
    }

    @objc func dateChanged(_ datePicker: UIDatePicker) {
        print("DATE :: \(datePicker.date)")
        let date = datePicker.date
       // let    selectedDate = USTUtilities.formattedStringFromDate(date: date)
        delegate.updateSelectedDate(date: date, selectedPicker: selectedPicker)

    }
}