Detect when UITableView has scrolled to the bottom

Try this:

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let height = scrollView.frame.size.height
    let contentYOffset = scrollView.contentOffset.y
    let distanceFromBottom = scrollView.contentSize.height - contentYOffset

    if distanceFromBottom < height {
        print("You reached end of the table")
    }
}

or you can try this way:

if tableView.contentOffset.y >= (tableView.contentSize.height - tableView.frame.size.height) {    
    /// you reached the end of the table
}

We can avoid using scrollViewDidScroll and use tableView:willDisplayCell

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    if indexPath.section == tableView.numberOfSections - 1 &&
        indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
        // Notify interested parties that end has been reached
    }
}

This should work for any number of sections.

Swift 3

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    if indexPath.row + 1 == yourArray.count {
        print("do something")
    }
}