ContactsViewController.swift

class ContactsViewController: UITableViewController {

    private var contacts:[SalesforceContact] = []
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        reloadContacts()
    }

    // MARK: - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        // return the number of sections
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // return the number of rows
        return contacts.count
    }

    
    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("contactCell", forIndexPath: indexPath) as! ContactCell

        // Configure the cell...
        
        let contact = contacts[indexPath.row]
        
        let firstName = contact.firstName != nil ? contact.firstName! : ""
        let lastName = contact.lastName != nil ? contact.lastName! : ""
        
        cell.nameLabel.text = "\(firstName) \(lastName)"
        cell.emailLabel.text = (contact.email ?? "").isEmpty ? "" : contact.email!

        return cell
    }
    
    @IBAction func refreshContacts(sender: UIRefreshControl) {
        reloadContacts()
    }
    
    func reloadContacts() {
        SalesforceManager.sharedInstance.fetchContacts { (contacts, error) in
            dispatch_async(dispatch_get_main_queue(), {
                self.refreshControl?.endRefreshing()
                if error == nil {
                    self.contacts = contacts
                    self.tableView.reloadData()
                } else {
                    let alertController = UIAlertController(title: "Error Loading Contacts", message: error!.localizedDescription, preferredStyle: .Alert)
                    self.presentViewController(alertController, animated: true, completion: nil)
                }
            })
        }
    }
}