title: UIColor colorWithRed:green:blue:alpha: always returns white unless one argument is 0
body: <p>I am using </p>
  
  <pre><code>[UIColor colorWithRed:136 green:155 blue:218 alpha:1.0]; 
  </code></pre>
  
  <p>to change the background color of my table view cells.</p>
  
  <p>But for some reason the background just stays white. If I try </p>
  
  <pre><code>[UIColor colorWithRed:0 green:155 blue:218 alpha:1.0]; 
  </code></pre>
  
  <p>the color changes. This does not make sense to me. Any advice or tips?</p>