Aligning collection view cells to fit exactly 3 per row

Question

I am trying to make a collection view of images, so that there are 3 per row, with no spacing in between.

My collection view data sources are:

func n         


        

Answer 1

1- You have to conform to UICollectionViewDelegateFlowLayout

2- You should implement collectionView(_:layout:sizeForItemAt:) method, as follows:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let screenWidth = UIScreen.main.bounds.width
    let scaleFactor = (screenWidth / 3) - 6

    return CGSize(width: scaleFactor, height: scaleFactor)
}

Assuming that the minimum spaces are 8 -for example-,

the output should be three items for each row, square sized.

Remark: If you want to set the spaces between the cells to be zero, then scaleFactor should be:

let scaleFactor = (screenWidth / 3)

Hope this helped.