title: How to make a random color with Swift
body: <p>How I can make a random color function using Swift?</p>
  
  <pre><code>import UIKit
  
  class ViewController: UIViewController {
  
      var randomNumber = arc4random_uniform(20)
      var randomColor = arc4random()
  
      //Color Background randomly
      func colorBackground() {
  
          // TODO: set a random color
          view.backgroundColor = UIColor.yellow
  
      }
  }
  </code></pre>