SteffenSr

  UICollectionViewCell* collectionViewCell = [self.collectionView cellForItemAtIndexPath:indexPath];
  collectionViewCell.layer.masksToBounds = NO;
  collectionViewCell.layer.cornerRadius = 8; // rounded corners
  CGColorRef redColor = [UIColor colorWithRed:1.0 green:0.0
                                         blue:0.0 alpha:1.0].CGColor;
  collectionViewCell.layer.shadowColor = redColor;
  collectionViewCell.layer.shadowOffset = CGSizeMake(-15, 20);
  collectionViewCell.layer.shadowRadius = 5;
  collectionViewCell.layer.shadowOpacity = 0.5;
  collectionViewCell.layer.shadowOffset = CGSizeMake(10,10);