Collection View Flow layout For Both Orientation

In this session we will learn collection view flow layout for both orientation support

Step : 1

First add UICollectionViewDelegateFlowLayout in your View Controller

Step : 2 Add this function in your View Controller

@IBOutlet weak var collDashboard: UICollectionView!

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {

        DispatchQueue.main.async {

            self.collDashboard?.collectionViewLayout.invalidateLayout()

            self.collDashboard.layoutIfNeeded()

            self.collDashboard.reloadData()

        }

    }

Step : 3

// we will change  the section Insets

Step : 4

// Collection View Cell Layout

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

        if UIDevice.current.orientation.isLandscape{

            let dimension:CGFloat = self.view.frame.size.width / 5

            return CGSize(width: dimension, height: collectionView.frame.size.height/2)

        }

        else if UIDevice.current.orientation.isFlat{

            if self.view.frame.size.width > self.view.frame.size.height{   //Landscape

                let dimension:CGFloat = self.view.frame.size.width / 5

                return CGSize(width: dimension, height: collectionView.frame.size.height/2)

            }

            else{

                let dimension:CGFloat = self.view.frame.size.width / 2

                return CGSize(width: dimension, height: collectionView.frame.size.height/5)

                

            }

        }

        else {

            let dimension:CGFloat = self.view.frame.size.width / 2

            return CGSize(width: dimension, height: collectionView.frame.size.height/5)

        }

        

    }