How to do a multiple popdown swift

I have this code that allows me to make a dropdown list with a textbox, but I need to replicate it with 4 more textboxes on the same screen and if I try to copy the functions as they are I get errors like the same options in each textbox. Any ideas?

class CarritoFinalViewController: UIViewController {
    @IBOutlet weak var txtfieldTAM: UITextField!
    @IBOutlet weak var textfieldMASA: UITextField!
    @IBOutlet weak var textfieldCHEESE: UITextField!
    @IBOutlet weak var textfieldING1: UITextField!
    @IBOutlet weak var textfieldING2: UITextField!
    @IBOutlet weak var textfieldING3: UITextField!
    @IBOutlet weak var TotalBillLable: UILabel!
    let tamanio = ["Pequeña", "Mediana", "Grande"]
    let masa = ["Fina", "Gruesa", "Bordes rellenos"]
    let queso = ["Parmesano", "Chedar", "Mozarela"]
    let ing1 = ["Ninguno","Más queso", "Pollo", "Huevo"]
    let ing2 = ["Ninguno","Más queso", "Pollo", "Huevo"]
    let ing3 = ["Ninguno","Más queso", "Pollo", "Huevo"]
    var pickerview = UIPickerView()
    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
    var shoppingCart: CarritoViewController!

    override func viewDidLoad() {

        pickerview.delegate = self
        pickerview.dataSource = self
        txtfieldTAM.inputView = pickerview
        txtfieldTAM.textAlignment = .center       


extension CarritoFinalViewController: UIPickerViewDelegate, UIPickerViewDataSource {
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return tamanio.count
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return tamanio[row]
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        txtfieldTAM.text = tamanio[row]


This question is more about Apple's UIKit Framework, than it is about Swift (the language).
You may have better success asking on either Apples Developer Forums, or on Stack Overflow.