Fill UICollectionView from left to right when scroll direction is horizontal

Question

When the scroll direction is horizontal, cells are added to the UICollectionView from top to bottom

To scroll = vertically, they are added from left to right.

The question is, is there a way to add cells from left to right when the scroll direction is horizontal?

Answer 1

The order is automatically created in the scroll direction, which is set by default.

What you can do is add a custom layout for the UICollectionView using the layoutAttributesForItemAtIndexPath method to set the frame for each individual cell.

 -(UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewLayoutAttributes* attr = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath]; CGRect cellFrame = CGRectMake(/* calculate your origin x */, /* calculate your origin y */, /* calculate your width */, /* calculate your height */); attr.frame = cellFrame; return attr; } 

More information can be found here.

Answer 2

You need to use UICollectionViewFlowLayout and set the scrollDirection property to

 flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal; 

The default value is vertical (top to bottom)

Answer 3

Each type of collection has a layout property that allows you to change the scroll direction. You can do it:

 collectionView.collectionViewLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;