Custom Drop Down | Swift 4

 Implement the Drop Down menu in iOS using swift 4 in xcode 9. I have searched questions Custom Drop Down, but they prefer making use of UIPicker  . Is it possible to achieve this type by using the table view, so finaly i use found this way.

1. Create layout like this

2. in UIviewController.swift

import UIKit

class DropDownViewController: UIViewController {
    @IBOutlet var textField: UITextField!
    @IBOutlet var bV: UIButton!
    @IBOutlet var tabelView1: UITableView!
    @IBOutlet var textFieldEdit: UITextField!
    
    //keyboard (bottom uitextfield)
    @IBOutlet var keyboardHeightLayoutConstraint: NSLayoutConstraint?
    
    let array = ["data1", "data2", "data3", "data4", "data5"]
    
    
    @IBAction func bActionV(_ sender: Any) {
        self.tabelView1.isHidden = !self.tabelView1.isHidden
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.tabelView1.isHidden = true
        self.tabelView1.register(UINib(nibName: "ApiTableViewCell", bundle: nil), forCellReuseIdentifier: "cell")
        
        //keyboard
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardNotification(notification:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }
    
    //keyboard
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    
    //keyboard
    @objc func keyboardNotification(notification: NSNotification) {
        if let userInfo = notification.userInfo {
            let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            let endFrameY = endFrame?.origin.y ?? 0
            let duration:TimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
            let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
            let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIViewAnimationOptions.curveEaseInOut.rawValue
            let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)
            if endFrameY >= UIScreen.main.bounds.size.height {
                self.keyboardHeightLayoutConstraint?.constant = 0.0
            } else {
                self.keyboardHeightLayoutConstraint?.constant = (endFrame?.size.height)! + 50
            }
            UIView.animate(withDuration: duration, delay: TimeInterval(0), options: animationCurve, animations: { self.view.layoutIfNeeded() }, completion: nil)
            
            
        }
    }
    
    //---------------------
}

extension DropDownViewController: UITableViewDataSource, UITableViewDelegate {
    func numberOfSections(in tableView: UITableView) -> Int {
        return 10
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.array.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ApiTableViewCell
        cell.merkLabel.text = array[indexPath.row]
        
        return cell
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let cell = tableView.cellForRow(at: indexPath) as? ApiTableViewCell
        
        self.textField.text = cell?.merkLabel.text
        
        bV.setTitle(cell?.textLabel?.text, for: .normal)
        self.tabelView1.isHidden = true
    }
}

or try this video