Fix for iOS 8 self sizing UITableViewCell "jumping" issue (http://stackoverflow.com/questions/26370879/ios-8-uitableview-self-sizing-cells-jump-shift-visually-when-a-new-view-controll)

JumpFixTableViewController.swift

//
//  JumpFixTableViewController.swift
//
//  Created by Indragie on 1/3/15.
//  Copyright (c) 2015 Indragie Karunaratne. All rights reserved.
//

import UIKit

/// Table view controller that implements a workaround for a bug where 
/// pushing a view controller onto the navigation stack causes the cells
/// to shift slightly (presumably because its getting the estimated row heights
/// again, for some reason).
class JumpFixTableViewController: UITableViewController {
    // There is a known issue on iOS 8 with the cell jumping when a new
    // view controller is pushed. Documented here:
    // http://stackoverflow.com/questions/25937827/table-view-cells-jump-when-selected-on-ios-8
    // http://stackoverflow.com/questions/26370879/ios-8-uitableview-self-sizing-cells-jump-shift-visually-when-a-new-view-controll
    // http://stackoverflow.com/questions/26598453/ios-8-auto-cell-height-didselectrowatindexpath-causes-uitableview-to-jump-to-t
    //
    // Reloading data before the view disappears is a workaround.
    
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
        
        // Reload data preserving selection
        if let indexPath = tableView.indexPathForSelectedRow() {
            tableView.reloadData()
            tableView.selectRowAtIndexPath(indexPath, animated: false, scrollPosition: .None)
        }
    }
    
    override func viewDidDisappear(animated: Bool) {
        super.viewDidDisappear(animated)
        
        // Deselect the row here instead of -tableView:didSelectRowAtIndexPath:
        // to preserve the selected state until the new view controller has
        // been pushed onto the navigation stack.
        if let indexPath = tableView.indexPathForSelectedRow() {
            tableView.deselectRowAtIndexPath(indexPath, animated: true)
        }
    }
}

Is seems to fix the problem with the visible shifting as the navigationcontroller pushes a view controller onto the stack, but it still seems to shift the cells, so that when one pops the view controller, the tableview is not at the same scroll position as it were when you selected the cell.