Fit given number of cells in uicollectionview per row

Question

I have a collection view and I would like to have let\'s say 4 cells per row. I know that to accomplish this all I need to do is divide collectionview.frame.size.width

Answer 1

Swift 4+

UICollectionViewDataSource method

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    let noOfCellsInRow = 4

    let flowLayout = collectionViewLayout as! UICollectionViewFlowLayout

    let totalSpace = flowLayout.sectionInset.left
        + flowLayout.sectionInset.right
        + (flowLayout.minimumInteritemSpacing * CGFloat(noOfCellsInRow - 1))

    let size = Int((collectionView.bounds.width - totalSpace) / CGFloat(noOfCellsInRow))

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