UITableViewCell with limit on the number of characters

TextFieldWithLabelCell.swift

//
//  TextFieldWithLabelCell.swift
//  Apy
//
//  Created by Artur Daylidonis on 20/5/20.
//  Copyright © 2020 Artur Daylidonis. All rights reserved.
//

import UIKit

class TextFieldWithLabelCell: UITableViewCell, UITextFieldDelegate {
    
    var maxLength = 100
    
    // Declare callback function variable
    var returnValue: ((_ value: String)->())?
    
    @IBOutlet weak var customLabel: UILabel!
    @IBOutlet weak var textField: UITextField!

    override func awakeFromNib() {
        super.awakeFromNib()
        
        textField.delegate = self
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
    }
    
    func textFieldDidChangeSelection(_ textField: UITextField) {
        returnValue?(textField.text ?? "")
    }
    
    func textFieldDidEndEditing(_ textField: UITextField) {
        returnValue?(textField.text ?? "")
    }
    
    func textFieldShouldClear(_ textField: UITextField) -> Bool {
        true
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        // get the current text, or use an empty string if that failed
        let currentText = textField.text ?? ""

        // attempt to read the range they are trying to change, or exit if we can't
        guard let stringRange = Range(range, in: currentText) else { return false }

        // add their new text to the existing text
        let updatedText = currentText.replacingCharacters(in: stringRange, with: string)

        // make sure the result is under 16 characters
        return updatedText.count <= maxLength
    }
}