When I entered the text in textfield to filter the array and show in drop down list. But after entered 2nd letter drop down is showing on it.

[KOSURUUDAYSAIKUMAR]

import UIKit

@objc protocol DateFormatDelegate: AnyObject {
@objc func dateFilteredCases(date: [String])
@objc func presentPopupViewController(_ viewController: UIViewController)

}
class DateCalendarTableViewCell: UITableViewCell {

@IBOutlet weak var dateFormat: UITextField!
@IBOutlet weak var setDateTextField: UITextField!
@IBOutlet weak var dateLabel: UILabel!

@IBOutlet weak var calendarTextField: UITextField!
@IBOutlet weak var restrictMonth: UITextField!
@IBOutlet weak var previousCalendarDate: UITextField!

weak var dateDelegate: DateFormatDelegate?
let centeredDropDown = DropDown()
lazy var dropDowns: [DropDown] = {
    return [centeredDropDown]
}()
var filteredCases = [String]()

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code
    dateLabel.text = "Eg: dd-MM-YY, dd-MM-YYYY, MM-dd-YYYY, yyyy-MM-dd, YYYY-MM-dd HH:mm, YYYY-MM-dd HH:mm:ss"
    dateFormat.delegate = self
    dropDowns.forEach { $0.dismissMode = .onTap }
    dropDowns.forEach { $0.direction = .bottom }
}

func setupUI() {
  
}

override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)
    // Configure the view for the selected state
}

}

extension DateCalendarTableViewCell: UITextFieldDelegate {
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
// filteredCases = ["dd MMM yyyy HH:mm zzz", "dd MMM yyyy HH:mm", "dd-MM-yy", "dd-MM-yyyy"]
return true
}

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    if textField == dateFormat {
        if let text = (textField.text as NSString?)?.replacingCharacters(in: range, with: string) {
            filteredCases = DateFormate.filterCases(startingWith: text, caseSensitive: true)
            print("Filtered cases: \(filteredCases)")
            dateDelegate?.dateFilteredCases(date: filteredCases)
            DispatchQueue.main.async(group: .none, qos: .background, execute: { [self] in
                centeredDropDown.show()
                dropDownHandler()
            })
        }
    }
    return true
}

func dropDownHandler() {
    centeredDropDown.anchorView = dateFormat
    centeredDropDown.dataSource = filteredCases
    centeredDropDown.selectionAction = { [self] (index, item) in
        print("Item ", item)
        dateFormat.text = item
        setDateTextField.text = Date().convertToString(formate: item)
        centeredDropDown.hide()
    }
}

}

extension DateCalendarTableViewCell: calendarDateSelectDelegate {
func selectedDate(text: String, tag: Int) {
if tag == 0 {
calendarTextField.text = text
} else {
previousCalendarDate.text = text
}
}
}

extension DateCalendarTableViewCell: UIViewControllerTransitioningDelegate {

}