Extension to connect more UITextFields together and enable "Next" keyboard button to cycle through them. When reaching the last one button becomes "Done" and keyboard is dismissed

UITextField+Extensions.swift

//
//  UITextField.swift
//  MasjidLink
//
//  Created by Sebastian Vidrea on 07/06/2019.
//  Copyright © 2019 Sebastian Vidrea. All rights reserved.
//

import Foundation
import UIKit

extension UITextField {

    class func connectFields(fields: [UITextField]) -> Void {
        guard let last = fields.last else {
            return
        }
        
        for index in 0 ..< fields.count - 1 {
            fields[index].returnKeyType = .next
            fields[index].addTarget(fields[index + 1],
                                    action: #selector(UIResponder.becomeFirstResponder),
                                    for: .editingDidEndOnExit)
        }
        
        last.returnKeyType = .done
        last.addTarget(last, action: #selector(UIResponder.resignFirstResponder),
                       for: .editingDidEndOnExit)
    }

}