Warning (Logging only once for UICollectionViewFlowLayout cache mismatched frame)

[Akib11]

Console Output [ios 9 xcode 7]

2015-09-19 13:19:42.121 Wish'List[1710:60831] Logging only once for UICollectionViewFlowLayout cache mismatched frame
2015-09-19 13:19:42.122 Wish'List[1710:60831] UICollectionViewFlowLayout has cached frame mismatch for index path <NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0} - cached value: {{33.284175409625227, 84.198445826909605}, {307.14784245047292, 502.39185839645393}}; expected value: {{35, 83.5}, {305, 500.25}}
2015-09-19 13:19:42.123 Wish'List[1710:60831] This is likely occurring because the flow layout subclass RGCardViewLayout is modifying attributes returned by UICollectionViewFlowLayout without copying them

how to fix this warning ?

[andrea-steva]

In the layoutAttributesForElementsInRect method you have to working on a copy of UICollectionViewLayoutAttributes

This is my warning fix:

    override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributes = super.layoutAttributesForElementsInRect(rect)

        let cellIndices = self.collectionView!.indexPathsForVisibleItems()

        if cellIndices.count == 0 {
            return attributes
        } else if (cellIndices.count == 1) {
            mainIndexPath = cellIndices.first!
            movingInIndexPath = nil
        } else if (cellIndices.count > 1) {
            let firstIndexPath = cellIndices.first
            if (firstIndexPath == mainIndexPath) {
                movingInIndexPath = cellIndices[1];
            } else {
                movingInIndexPath = cellIndices.first!
                mainIndexPath = cellIndices[1]
            }
        }

        difference =  self.collectionView!.contentOffset.x - previousOffset;
        previousOffset = self.collectionView!.contentOffset.x;

        var attributesCopy = [UICollectionViewLayoutAttributes]()
        for itemAttributes in attributes! {
            let itemAttributesCopy = itemAttributes.copy() as! UICollectionViewLayoutAttributes
            self.applyTransformToLayoutAttributes(itemAttributesCopy)
            attributesCopy.append(itemAttributesCopy)
        }
        return  attributesCopy
    }