title: Get context from UIImageView
body: <p>Can I get the context (<code>CGContextRef</code>) from exists <code>UIImageView</code>?</p>
  
  <p>Detail: I have a controller link to xib file. In IB I have added a <code>UIImageView</code> and reference its on:</p>
  
  <pre><code>IBOutlet UIImageView *imageView;
  </code></pre>
  
  <p>Now, in <code>viewDidLoad</code> How get the <code>UIImageView</code>  context (<code>CGContextRef</code>)?</p>
  
  <p>Before this, If I use:</p>
  
  <pre><code>CGContextRef context = UIGraphicsGetCurrentContext();
  </code></pre>
  
  <p>output:</p>
  
  <pre><code>&lt;Error&gt;: CGContextTranslateCTM: invalid context
  </code></pre>
  
  <p>suggest?</p>