How do I use compositional layouts in UICollectionView in Swift?

Compositional layouts are a powerful way to configure the layout of items in a UICollectionView in Swift. They allow for complex and hierarchical layouts that can be adjusted dynamically. Here’s a basic example of how to implement compositional layouts in a UICollectionView.

import UIKit class ViewController: UIViewController { private let collectionView: UICollectionView = { let layout = UICollectionViewCompositionalLayout { sectionIndex, environment in // Define item size let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .fractionalHeight(1.0)) let item = NSCollectionLayoutItem(layoutSize: itemSize) // Create a group let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .absolute(200)) let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item]) // Create a section let section = NSCollectionLayoutSection(group: group) return section } let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout) collectionView.backgroundColor = .white return collectionView }() override func viewDidLoad() { super.viewDidLoad() view.addSubview(collectionView) collectionView.translatesAutoresizingMaskIntoConstraints = false NSLayoutConstraint.activate([ collectionView.topAnchor.constraint(equalTo: view.topAnchor), collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor), collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor), collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor) ]) } }

compositional layouts UICollectionView Swift iOS development

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