How do i automatically scroll in a table view? (Swift)

You have to call the method scrollToRowAtIndexPath in the following way :

var indexPath = NSIndexPath(forRow: numberOfRowYouWant, inSection: 0)
self.tableview.scrollToRowAtIndexPath(indexPath, 
               atScrollPosition: UITableViewScrollPosition.Middle, animated: true)

The above example assume you have only one section. I hope this help you.

For Swift 3:

let indexPath = NSIndexPath(item: numberOfRowYouWant, section: 2)
tableView.scrollToRow(at: indexPath as IndexPath, at: UITableViewScrollPosition.middle, animated: true)

For Swift 4:

let indexPath = NSIndexPath(item: numberOfRowYouWant, section: 2)
tableView.scrollToRow(at: indexPath as IndexPath, at: UITableView.ScrollPosition.middle, animated: true)

For Swift 5 ( Xcode 11.2.1 ):

    let numberOfSections = self.tableView.numberOfSections
    let numberOfRows = self.tableView.numberOfRows(inSection: numberOfSections-1)

    let indexPath = IndexPath(row: numberOfRows-1 , section: numberOfSections-1)
    self.tableView.scrollToRow(at: indexPath, at: .middle, animated: true)

For Swift 2:

    let numberOfSections = self.tableView.numberOfSections
    let numberOfRows = self.tableView.numberOfRows(inSection: numberOfSections-1)

    let indexPath = IndexPath(row: numberOfRows-1 , section: numberOfSections-1)
    self.tableView.scrollToRow(at: indexPath, at: UITableViewScrollPosition.middle, animated: true)

If you want scroll down automatically:

numberOfSections = tableView.numberOfSections()
let numberOfRows = tableView.numberOfRowsInSection(numberOfSections-1)

var indexPath = NSIndexPath(forRow: numberOfRows, inSection: numberOfSections)
self.tableview.scrollToRowAtIndexPath(indexPath, 
               atScrollPosition: UITableViewScrollPosition.Middle, animated: true)

Swift 4:

let numberOfSections = tableView.numberOfSections
let numberOfRows = tableView.numberOfRows(inSection: numberOfSections - 1)

let indexPath = NSIndexPath(row: numberOfRows, section: numberOfSections)
self.tableView.scrollToRow(at: indexPath as IndexPath,
                                  at: UITableView.ScrollPosition.middle, animated: true)