Borders and rounded corners in UICollectionView

roundedborders.m

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"productCell" forIndexPath:indexPath];
    
    CALayer* layer = cell.layer;
    
    [layer setCornerRadius:4.0f];
    [layer setBorderColor:[UIColor colorWithWhite:0.8 alpha:1].CGColor];
    [layer setBorderWidth:1.0f];
    
    return cell;
}