I am trying to make a grid of cells by using UICollectionView.
I would remove all padding, spacing among cells.
I used the layout methods and properties 

```
-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
    return 0;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath 
{
    CGSize retval = CGSizeMake(120, 120);
      return retval;
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    return UIEdge

    InsetsMake(0, 0, 0, 0);
}

```

But I get always a space among columns.

![enter image description here](https://i.stack.imgur.com/3oNPs.png)