使用Parse刷新数据

Question

我有问题。我需要当按下按钮时，这将自动刷新我的页面，将新内容放入其中。可能在发生这种情况时，我希望按钮能够进行圆形动画。提前谢谢。

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

只需使用您创建的功能重新加载新数据即可。将其移到viewDidLoad函数之外。 使用要重新加载数据的按钮添加IBAction并添加retrieveMessages（）。重新加载时，将自动加载新数据。

@IBAction func refreshData(sender: AnyObject) {
retrieveMessages()
}

对于圆圈动画，我建议使用UIActivityIndicatorView。