How to make a UIScrollView snap to icons (like App Store: Feature)

Question

What I want to get is the same behaviour that this scroll view has:

Answer 1

Chiming in for Swift. @avdyushin's answer is by far the simplest and, as Ben mentioned, works very well. Although I did add a piece from @Rob's answer regarding the end of the scrollview. Together, this solution seems to work perfectly.

func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer) {

    if ((scrollView.contentOffset.x + scrollView.frame.size.width) >= scrollView.contentSize.width) {
        // no snap needed ... we're at the end of the scrollview
        return
    }

    let index: CGFloat = CGFloat(lrintf(Float(targetContentOffset.memory.x) / kCellBaseWidth))
    targetContentOffset.memory.x = index * kCellBaseWidth

}

Just add your minimumLineSpacing to kCellBaseWidth, and voila.