title: writeToFile how to tell when it is completed
body: <p>I'm doing some writing of data to my documents directory and I was wondering if there is a way to tell when my writeToFile method completes and the file I am creating has be fully created. Thanks in advance here is the method I am calling I am just looking for a way wether it is a delegate method or some other way to tell when this completes.</p>
  
  <pre><code>[imageData writeToFile:fullPathToFile atomically:YES];
  </code></pre>
  
  <p>Nick</p>