当滚动方向为水平时，从左到右填充UICollectionView

Question

When scrolling direction is horizontal cells are added in UICollectionView from top to bottom

For scrolling direction = vertical, they are added from left to right.

The question is, if there is any way to add cells from left to right when scrolling direction is horizontal ?

Answer 1

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

What you can do is to add a custom layout for the UICollectionView by using the layoutAttributesForItemAtIndexPath method to set a 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 details can be found here

Answer 2

You need to use UICollectionViewFlowLayout and set the scrollDirection property to

flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;

Default setting is is vertical (top to bottom)

Answer 3

每个集合视图都有布局属性，允许您更改滚动方向。您可以这样做：

collectionView.collectionViewLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;