Overlapped UICollectionView Cells

Question

For unknown reasons the cells overlapping like in the pictures below, how can I fix that problem?

Answer 1

Solved it

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: self.view.frame.size.width, height: 200)
}