Refreshing data using Parse - ios

Question

I have a problem. I need that when I press a button this will automatically refresh my page putting inside it the new content. Possibly while this happens, I would like the button to do a circle animation. Thanks in advance.
class ViewControllerAvvisi: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate
{
var selfTable: NSMutableArray = NSMutableArray()
#IBOutlet weak var MessageTable: UITableView!
#IBOutlet weak var MessageTextField: UITextField!
#IBOutlet weak var SendMessage: UIButton!
var messagesArray:[String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
self.MessageTable.delegate = self
self.MessageTable.dataSource = self
self.MessageTable.delegate = self
let tapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "TableViewTapped")
self.MessageTable.addGestureRecognizer(tapGesture)
func retrieveMessages() {
let query = PFQuery(className: "Message")
query.findObjectsInBackgroundWithBlock {
(remoteObjects: [PFObject]?, error: NSError?) -> Void in
self.messagesArray = [String]()
for messageObject in remoteObjects! {
let messageText: String? = (messageObject as PFObject) ["Text"] as? String
if messageText != nil {
self.messagesArray.append(messageText!)
}
}
self.MessageTable.reloadData()
}
}
retrieveMessages()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.MessageTable.dequeueReusableCellWithIdentifier("MessageCell")! as UITableViewCell
cell.textLabel?.text = self.messagesArray[indexPath.row]
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messagesArray.count
}
#IBAction func SendMessage(sender: AnyObject) {
self.MessageTable.endEditing(true)
let NewMessage: PFObject = PFObject (className: "Message")
NewMessage["Text"] = self.MessageTextField.text
self.MessageTextField.enabled = false
self.SendMessage.enabled = false
NewMessage.saveInBackgroundWithBlock { (success:Bool, NSError) -> Void in
if (success == true) {
NSLog("Message successfully saved")
}else{
NSLog("Message didn't save")
}
self.MessageTextField.enabled = true
self.SendMessage.enabled = true
self.MessageTextField.text = ""
}
}
#IBAction func Refresh(sender: AnyObject) {
}
}

Answer 1

Just use the function you created to reload the new data. Move it outside of the viewDidLoad function.
Add an IBAction with the button you want to reload data and add retrieveMessages(). As you reload, new data will automatically be loaded.
#IBAction func refreshData(sender: AnyObject) {
retrieveMessages()
}
For the circle animation, I recommend using a UIActivityIndicatorView.