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| class ViewController: UIViewController {
weak var collectionView: UICollectionView!
var data: [Int] = Array(0..<10)
override func loadView() { super.loadView()
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout()) collectionView.translatesAutoresizingMaskIntoConstraints = false self.view.addSubview(collectionView) NSLayoutConstraint.activate([ self.view.topAnchor.constraint(equalTo: collectionView.topAnchor), self.view.bottomAnchor.constraint(equalTo: collectionView.bottomAnchor), self.view.leadingAnchor.constraint(equalTo: collectionView.leadingAnchor), self.view.trailingAnchor.constraint(equalTo: collectionView.trailingAnchor), ]) self.collectionView = collectionView }
override func viewDidLoad() { super.viewDidLoad()
self.collectionView.dataSource = self self.collectionView.delegate = self self.collectionView.register(Cell.self, forCellWithReuseIdentifier: Cell.identifier) self.collectionView.alwaysBounceVertical = true self.collectionView.backgroundColor = .white } }
extension ViewController: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return self.data.count }
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Cell.identifier, for: indexPath) as! Cell let data = self.data[indexPath.item] cell.textLabel.text = String(data) return cell } }
extension ViewController: UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
} }
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { return CGSize(width: collectionView.bounds.width, height: 44) }
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets { return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) }
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat { return 0 }
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat { return 0 } }
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