title: How can I modify a UIColor's hue, brightness and saturation?
body: <p>Lets say I have a UIColor</p>
  
  <pre><code>UIColor *color = [UIColor redColor];
  </code></pre>
  
  <p>Now I want to modify the saturation/hue/brigthness, how do I do that?
  I did read the documentation but i'm still really confused</p>
  
  <p>I want to modify the UIColor I made ([UIColor redColor]) not initiate a new color with some preferences. How do I modify it retaining the original. I do know about the<code>colorWithHue:saturation:brightness:alpha:</code> method, I need to update an existing color's properties, keeping the red color.</p>