title: Change an UIImageView's alpha and show from UIActionSheet
body: <p>In my UIActionSheet I have a button which mark the touched array as favorite. When an array is favorite, I have a star that shows before the array's name. The favorite icon has an alpha 0, and by touching the "Add as Favorite" button the alpha changes to 1. The arrays are located inside an UIViewController, which shows 1 array in each cell.</p>
  
  <p>The problem I have is that I have to reopen the ViewController for the star to show.</p>
  
  <p>How can I fix so the star shows immediately when I press the "Add as Favorite" button, without reopening the ViewController?</p>
  
  <p>The Favorite Icons alpha is updated under:</p>
  
  <pre><code>- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
  </code></pre>
  
  <p>And this is the code that updated the alpha:</p>
  
  <pre><code> if ([FavoriteArray containsObject: [mainArray objectAtIndex:indexPath.row]])
          {
              favoriteImage.alpha = 1;
  
          }
  </code></pre>
  
  <p>Thanks!</p>