title: Pull to refresh not performing refreshing function?
body: <p>I am coding an app and have a set up queryAndAppend functions that query a DB and append the info pulled to a set of arrays (which are then used to iterate through cells in a table view). The query functions work appropriately  as they are called in the <code>viewDidLoad()</code>. I want a pull to refresh function to additionally call the functions (and thus update the table cells) but it is not working properly. Here is the relevant code:</p>
  
  <pre><code>var refreshControl = UIRefreshControl()
      override func viewDidLoad() {
              super.viewDidLoad()
  
              myQueryandAppend(completion: {
                  self.tableView.reloadData()
              })
  
              upComingQueryandAppend(completion: {
                  self.tableView.reloadData()
              })
  
              refreshControl = UIRefreshControl()
              refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
              refreshControl.addTarget(self, action: #selector(MainPageVC.refresh(_:)), for: UIControlEvents.valueChanged)
  
          }
          func refresh(_ sender: AnyObject){
  
              myQueryandAppend(completion: {
                  self.tableView.reloadData()
                  self.refreshControl.endRefreshing()
  
              })
              upComingQueryandAppend(completion:{
  
                  self.tableView.reloadData()
                  self.refreshControl.endRefreshing()
  
              })
  
          }
  </code></pre>
  
  <p>Not entirely sure why its not working as I have a very similar set up in a different view controller (with a different query/append function) that works properly with pull to refresh.</p>