Preventing “wrapping” of items in UICollectionView

Question

I need a UICollectionView to display a grid that is potentially larger than the visible frame in both width and height, while maintaining row and column integrity.

Answer 1

Here is a version of AndrewK's code updated to Swift 4:

import UIKit

class CollectionViewMatrixLayout: UICollectionViewLayout {

  var itemSize: CGSize
  var interItemSpacingY: CGFloat
  var interItemSpacingX: CGFloat
  var layoutInfo: [IndexPath: UICollectionViewLayoutAttributes]

  override init() {
    itemSize = CGSize(width: 50, height: 50)
    interItemSpacingY = 1
    interItemSpacingX = 1
    layoutInfo = [IndexPath: UICollectionViewLayoutAttributes]()

    super.init()
  }

  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  override func prepare() {
    guard let collectionView = self.collectionView else {
      return
    }

    var cellLayoutInfo = [IndexPath: UICollectionViewLayoutAttributes]()
    var indexPath = IndexPath(item: 0, section: 0)

    let sectionCount = collectionView.numberOfSections
    for section in 0.. CGRect {
    let row = indexPath.section
    let column = indexPath.item

    let originX = (itemSize.width + interItemSpacingX) * CGFloat(column)
    let originY = (itemSize.height + interItemSpacingY) * CGFloat(row)

    return CGRect(x: originX, y: originY, width: itemSize.width, height: itemSize.height)
  }

  override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]?
  {
    var allAttributes = Array()

    for (_, attributes) in self.layoutInfo {
      if (rect.intersects(attributes.frame)) {
        allAttributes.append(attributes)
      }
    }
    return allAttributes
  }

  override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
    return self.layoutInfo[indexPath]
  }

  override var collectionViewContentSize: CGSize {
    guard let collectionView = self.collectionView else {
      return .zero
    }

    let sectionCount = collectionView.numberOfSections
    let height = (itemSize.height + interItemSpacingY) * CGFloat(sectionCount)

    let itemCount = Array(0..