title: Sum of three textfield value without clicking a button (Swift - Xcode)
body: <p>I'm currently having problems for my label to read the addition of 3 textfield values automatically, without a button function action. As such i only want my textfield to be an Int input only. There's a screenshot attached below for better reference. Appreciate those who can help me with this. Thanks!</p>
  
  <p>ViewController</p>
  
  <pre><code>import UIKit
  
  class TryingoutController: UIViewController {
      @IBOutlet var impact: UITextField!
      @IBOutlet var rigour: UITextField!
      @IBOutlet var response: UITextField!
      @IBOutlet var total: UILabel!
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/QCsmI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QCsmI.png" alt="enter image description here"></a></p>