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 complete matrix customLayout:

import UIKit

class MatrixLayout: UICollectionViewLayout {

    var itemSize: CGSize!
    var interItemSpacingY: CGFloat!
    var interItemSpacingX: CGFloat!
    var layoutInfo: Dictionary!

    required init?(coder aDecoder: NSCoder) {

        super.init(coder: aDecoder)

        itemSize = CGSizeMake(50.0, 50.0)
        interItemSpacingY = 1.0
        interItemSpacingX = 1.0
    }

    override func prepareLayout() {

        var cellLayoutInfo = Dictionary()

        let sectionCount = self.collectionView?.numberOfSections()
        var indexPath = NSIndexPath(forItem: 0, inSection: 0)

        for (var section = 0; section < sectionCount; section += 1)
        {
            let itemCount = self.collectionView?.numberOfItemsInSection(section)

            for (var item = 0; item < itemCount; item += 1)
            {
                indexPath = NSIndexPath(forItem:item, inSection: section)
                let itemAttributes = UICollectionViewLayoutAttributes(forCellWithIndexPath: indexPath)
                itemAttributes.frame = frameForCellAtIndexPath(indexPath)
                cellLayoutInfo[indexPath] = itemAttributes
            }

            self.layoutInfo = cellLayoutInfo
        }
    }

    func frameForCellAtIndexPath(indexPath: NSIndexPath) -> CGRect
    {
        let row = indexPath.section
        let column = indexPath.item

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

        return CGRectMake(originX, originY, self.itemSize.width, self.itemSize.height)
    }

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

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

    override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? {
        return self.layoutInfo[indexPath]
    }


    override func collectionViewContentSize() -> CGSize {

        let width:CGFloat = (self.itemSize.width + self.interItemSpacingX) * CGFloat((self.collectionView?.numberOfItemsInSection(0))!)
        let height:CGFloat = (self.itemSize.height + self.interItemSpacingY) * CGFloat((self.collectionView?.numberOfSections())!)

        return CGSizeMake(width, height)
    }
}

sections are rows, items are columns