title: how do i change an image if i click on a button in Swift?
body: <p>I am new to swift. I have a button and 3 images that are saved in the array. What I want is to change the images​ by clicking on the button. </p>
  
  <pre><code>let circleArray = ["circle-gray-big","circle-green-big","circle-red-big"]
  @IBAction func carbsButton(_ sender: Any) {
  
  }
  </code></pre>