title: iphone store kit : how to catch cancel event
body: <p>Here's my problem :</p>
  
  <p>When using storekit for in-app purchase, i'm displaying a "loading" view to tell the user to wait for a few seconds while the process is in progress; but let's say this same user, when the storekit ask him for his itunes account password, press the "cancel" button... How can i "catch" this event in order to hide the loading view?</p>
  
  <p>I'm afraid it could be a cause of rejection for Apple since user's communication is pretty important.</p>
  
  <p>Thanks for any tips!</p>
  
  <p>Edit : I'm not in a transaction here; my first step is to restore completed transactions so the password prompt is trigger by this method :</p>
  
  <pre><code>[[SKPaymentQueue defaultQueue] restoreCompletedTransactions]
  </code></pre>