title: Get size of repeated pattern from UIColor?
body: <p>I can query if a <code>UIColor</code> is a pattern by inspecting the <code>CGColor</code> instance it wraps, the <code>CGColorGetPattern()</code> function returns the pattern if it exist, or <code>null</code> if it is not a pattern color.</p>
  
  <p><code>CGPatternCreate()</code> method requires a <code>bounds</code> when creating a pattern, this value defines the size of the pattern tile <em>(Known as cell in Quartz parlance)</em>.</p>
  
  <p>How would I go about to retrieve this pattern size from a <code>UIColor</code>, or the backing <code>CGPattern</code> once it has been created? </p>