UITableView keeps autoscrolling to top - ios

Question

When the user tries scrolling down the table (goes past the keyboard height), it automatically scrolls back to the top of table, leaving the user unable to press any of the keys in the bottoms rows of the table. How do I disable this autoscroll to top? Note this is different from the scrollsToTop property.
import UIKit
class KeyboardViewController: UIInputViewController, UITableViewDelegate, UITableViewDataSource {
var tableView: UITableView = UITableView()
let screenSize: CGRect = UIScreen.mainScreen().bounds
let buttonTitles = [
"XX",
"YY"
]
override func viewDidLoad() {
super.viewDidLoad()
let screenWidth = screenSize.width
let screenHeight = screenSize.height
tableView.frame = CGRectMake(0,0,screenWidth,screenHeight - 40)
tableView.delegate = self
tableView.dataSource = self
tableView.registerClass(UITableViewCell.self,forCellReuseIdentifier: "cell")
self.view.addSubview(tableView)
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.buttonTitles.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell = tableView.dequeueReusableCellWithIdentifier("cell") as! UITableViewCell
cell.textLabel?.text = self.buttonTitles[indexPath.row]
cell.textLabel?.textAlignment = .Center
cell.textLabel?.font = UIFont(name: "Helvetica Neue", size: 14)
cell.textLabel?.textColor = UIColor.whiteColor()
cell.textLabel?.numberOfLines = 0
cell.backgroundColor = UIColor(red: 176/255, green: 15/255, blue: 15/255, alpha: 1.0)
cell.preservesSuperviewLayoutMargins = false
cell.layoutMargins = UIEdgeInsetsZero
cell.separatorInset = UIEdgeInsetsZero
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var string = buttonTitles[indexPath.row]
(textDocumentProxy as! UIKeyInput).insertText("\(string)")
}

Answer 1

Move your code except
tableView.delegate = self
tableView.dataSource = self
to viewWillAppear