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extension UICollectionView {
func scrollToNextItem() {
let contentOffset = CGFloat(floor(self.contentOffset.x + self.bounds.size.width))
self.moveToFrame(contentOffset: contentOffset)
}
func scrollToPreviousItem() {
let contentOffset = CGFloat(floor(self.contentOffset.x - self.bounds.size.width))
self.moveToFrame(contentOffset: contentOffset)
}
func moveToFrame(contentOffset : CGFloat) {
self.setContentOffset(CGPoint(x: contentOffset, y: self.contentOffset.y), animated: true)
}
}S
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