Warning: UICollectionViewFlowLayout has cached frame mismatch for index path ‘abc’

This is likely occurring because the flow layout “xyz” is modifying attributes returned by UICollectionViewFlowLayout without copying them

And sure enough, that’s just what you are doing:

private override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? {
    let attributes = super.layoutAttributesForItemAtIndexPath(indexPath)
    let distance = CGRectGetMidX(attributes!.frame) - self.midX;
    var transform = CATransform3DIdentity;
    transform = CATransform3DTranslate(transform, -distance, 0, -self.width);
    attributes!.transform3D = CATransform3DIdentity;
    return attributes

I expect that if you simply say:

let attributes = 
    as! UICollectionViewLayoutAttributes

or similar, the problem will go away.

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