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Swift collectionview ispagingenabled change page size

override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
    var offsetAdjustment = CGFloat.greatestFiniteMagnitude
    let horizontalOffset = proposedContentOffset.x
    let targetRect = CGRect(origin: CGPoint(x: proposedContentOffset.x, y: 0), size: self.collectionView!.bounds.size)

    for layoutAttributes in super.layoutAttributesForElements(in: targetRect)! {
        let itemOffset = layoutAttributes.frame.origin.x
        if (abs(itemOffset - horizontalOffset) < abs(offsetAdjustment)) {
            offsetAdjustment = itemOffset - horizontalOffset
        }
    }

    return CGPoint(x: proposedContentOffset.x + offsetAdjustment, y: proposedContentOffset.y)
}

Source: stackoverflow.com

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