Demo the drag and drop UITableViewCell in Swift 2.

Drag-and-drop-uitableviewcell-swift2.swift

struct Drag {
    static var placeholderView: UIView!
    static var sourceIndexPath: NSIndexPath!
}

func handleLongPress(gesture: UILongPressGestureRecognizer) {
    let point = gesture.locationInView(tableView)
    let indexPath = tableView.indexPathForRowAtPoint(point)

    switch gesture.state {
    case .Began:
        if let indexPath = indexPath {
            let cell = tableView.cellForRowAtIndexPath(indexPath)!
            Drag.sourceIndexPath = indexPath

            var center = cell.center
            Drag.placeholderView = placeholderFromView(cell)
            Drag.placeholderView.center = center
            Drag.placeholderView.alpha = 0

            tableView.addSubview(Drag.placeholderView)

            UIView.animateWithDuration(0.25, animations: {
                center.y = point.y
                Drag.placeholderView.center = center
                Drag.placeholderView.transform = CGAffineTransformMakeScale(1.05, 1.05)
                Drag.placeholderView.alpha = 0.95

                cell.alpha = 0
            }, completion: { (_) in
                cell.hidden = true
            })

        }
    case .Changed:
        guard let indexPath = indexPath else {
            return
        }

        var center = Drag.placeholderView.center
        center.y = point.y
        Drag.placeholderView.center = center

        if indexPath != Drag.sourceIndexPath {
            swap(&currentList.orderItems[indexPath.row], &currentList.orderItems[Drag.sourceIndexPath.row])
            tableView.moveRowAtIndexPath(Drag.sourceIndexPath, toIndexPath: indexPath)
            Drag.sourceIndexPath = indexPath
        }
    default:
        if let cell = tableView.cellForRowAtIndexPath(Drag.sourceIndexPath) {
            cell.hidden = false
            cell.alpha = 0

            UIView.animateWithDuration(0.25, animations: {
                Drag.placeholderView.center = cell.center
                Drag.placeholderView.transform = CGAffineTransformIdentity
                Drag.placeholderView.alpha = 0
                cell.alpha = 1
            }, completion: { (_) in
                Drag.sourceIndexPath = nil
                Drag.placeholderView.removeFromSuperview()
                Drag.placeholderView = nil
            })
        }
    }
}

func placeholderFromView(view: UIView) -> UIView {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0.0)
    view.layer.renderInContext(UIGraphicsGetCurrentContext())
    let image = UIGraphicsGetImageFromCurrentImageContext() as UIImage
    UIGraphicsEndImageContext()

    let snapshotView : UIView = UIImageView(image: image)
    snapshotView.layer.masksToBounds = false
    snapshotView.layer.cornerRadius = 0.0
    snapshotView.layer.shadowOffset = CGSizeMake(-5.0, 0.0)
    snapshotView.layer.shadowRadius = 5.0
    snapshotView.layer.shadowOpacity = 0.4
    return snapshotView
}