ios - UICollectionView, simply fit cell to width?

Question

Here's a simple UICollectionView in yellow

The red arrow sets the width of the cell. (TBC: clicking on the pink cell: for 'size' select 'Default', then what you set at the red arrow becomes the size of the cell.)

Example, for an upright iPhone set width to 320.

But this seems crazy ... surely I can set the cell width based on the width of the UICollectionView?

There's no problem autosizing the view itself ..

That works fine.

But it seems crazy that I can't set the width of the CELL to be "same as the view". It seems hard to believe one has to set it manually, in code?

TBC In other words, as Nikita points out,

-(CGSize) collectionView:(UICollectionView *)collectionView
     layout:(UICollectionViewLayout *)collectionViewLayout
     sizeForItemAtIndexPath:(NSIndexPath *)indexPath
    {
    return self.view.frame.size;
    }

(indeed you also typically need this ...)

-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView
   layout:(UICollectionViewLayout*)collectionViewLayout
   insetForSectionAtIndex:(NSInteger)section
    {
    return UIEdgeInsetsMake(0,0,0,0);   //t,l,b,r
    }

In fact - you have to do that in code?! There's no way to do that in Storyboard, with autolayout, or anything else?!

Answer 1

I think you need to take a look at

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

of UICollectionViewLayout where you can set size based on orientation and current frame.

---

It would indeed seem that you simply have to do this in code.