UICollectionView in iOS

Create a Collection View Programmatically

Swift

func createCollectionView() {
 let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
 let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: view.frame.width,height: view.frame.height), collectionViewLayout: layout)
    collectionView.dataSource = self
    collectionView.delegate = self
    view.addSubview(collectionView)}

Objective-C

- (void)createCollectionView {
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0,self.view.frame.size.width, self.view.frame.size.height) collectionViewLayout:layout]; [collectionView setDataSource:self];
 [collectionView setDelegate:self];
 [self.view addSubview:collectionView];}

UICollectionViewDelegateFlowLayout

// MARK: - UICollectionViewDelegateFlowLayoutextension ViewController: UICollectionViewDelegateFlowLayout {
 func collectionView(collectionView: UICollectionView, layout collectionViewLayout:UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        return CGSize(width: 50, height: 50)}func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets {return UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    }func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {return 5.0
 }func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {return 5.0 
}}