title: How to create a color with an alpha value using SwiftUI?
body: <p>In <code>UIKit</code> to create a color with an alpha value there are different ways, for example:</p>
  
  <pre><code>UIColor(red: 0, green: 0, blue: 0, alpha: 0.8)
  </code></pre>
  
  <p>but this method is not available on the corresponding class <code>Color</code> of <code>SwiftUI</code>.</p>
  
  <p>What can I use?</p>