PickerView.swift

//
//  PickerView.swift
//  PickerView
//
//  Created by Arpit on 08/01/19.
//  Copyright © 2018 Arpit. All rights reserved.
//
import UIKit

class PickerView : NSObject {

    // MARK: - Properties
    
    static let shared = PickerView()
    
    private var objPickerView : UIPickerView?
    private var pickerDataSource : [String]?
    private var objPickerBlock : ((_ selectedIndex:Int, _ selectedData: String) ->Void)?
    private var selectedIndex :Int = 0
    private var objViewController = UIViewController()
    
    private let toolbarBtnFont = UIFont.boldSystemFont(ofSize: 17.0)
    private let toolbarColor = UIColor.gray
    private let toolbarBtnColor = UIColor.white
    
    // MARK: -
    
    /// Use this method to display **Picker View** on any textfield
    ///
    /// - Parameters:
    ///   - textField: Object of textfield on which you need to an display Picker View.
    ///   - controller: Object of controller on which you need to an display Picker View.
    ///   - pickerArray: Pass your array of string for picker data
    ///   - completionBlock: You will get the call back here when user selected the data.
    
    func addPickerView(textField:UITextField,
                       controller:UIViewController,
                       pickerArray:[String],
                       completionBlock:@escaping ((_ selectedIndex:Int,_ selectedData: String) -> Void)) {
        
        objViewController = controller
        objPickerView = UIPickerView()
        objPickerView?.backgroundColor = UIColor.white
        objPickerView?.delegate = self
        objPickerView?.dataSource = self
        pickerDataSource = pickerArray
        
        textField.tintColor = UIColor.clear
        
        let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: controller.view.bounds.size.width, height: 44))
        toolBar.barTintColor = toolbarColor
        toolBar.tintColor =  toolbarBtnColor

        let flexSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        
        let done = UIBarButtonItem.init(title:"Done", style: .done, target: self, action:  #selector(doneClick))
        done.setTitleTextAttributes([NSAttributedString.Key.font: toolbarBtnFont], for: .normal)
        done.setTitleTextAttributes([NSAttributedString.Key.font: toolbarBtnFont], for: .selected)
        
        let cancel = UIBarButtonItem(title:"Cancel", style: .done, target: self, action:  #selector(cancelClick))
        cancel.setTitleTextAttributes([NSAttributedString.Key.font: toolbarBtnFont], for: .normal)
        cancel.setTitleTextAttributes([NSAttributedString.Key.font: toolbarBtnFont], for: .selected)
        
        toolBar.setItems([cancel,flexSpace,done], animated: true)
        textField.inputAccessoryView = toolBar
        
        if let index = pickerArray.index(of: textField.text!) {
            objPickerView!.selectRow(index, inComponent: 0, animated: true)
        }
        textField.inputView = objPickerView
        objPickerBlock = completionBlock
    }
    
    // MARK: - Button Click Event
    
    @objc func doneClick() {
        objPickerBlock!(selectedIndex, (pickerDataSource?[selectedIndex] ?? ""))
        objViewController.view.endEditing(true)
    }
    
    @objc func cancelClick() {
        objViewController.view.endEditing(true)
    }
}

// MARK: - UIPickerViewDataSource

extension PickerView : UIPickerViewDataSource{
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return (pickerDataSource?.count ?? 0)
    }
    
}

// MARK: - UIPickerViewDelegate

extension PickerView : UIPickerViewDelegate{
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return pickerDataSource?[row]
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){
        selectedIndex = row
    }
}

You can do one thing, add the button above the text field, and when the user click on button start text field editing like this

@IBAction func clickToSelectFilter(_ sender: UIButton) { self.view.endEditing(true) let arrTemp = ARRAY.REGION PickerManager.shared.addPickerView(textField: regionTxt, controller: self, pickerArray: arrTemp) { (index, value) in self.regionTxt.text = value } regionTxt.becomeFirstResponder() }