Refresh tableview after delete a tableview cell and refresh view controller

Question

I need answer for swift by the way. Basically, I have two questions for refreshing. If you think the code is too long to look at, this is what I'm trying to do. one is to refresh the tableview after clicking on the delete button on one of the tableview cell. I've tried refreshcontrol, it didn't work and it wasn't what I wanted but it would be cool to have them. My other question is, how to refresh a view controller by clicking on of the buttons. And here is the code.

The delete button is inside of my custom cell class class postCell: UITableViewCell{

@IBOutlet weak var deleteBtn: UIButton!
@IBOutlet weak var postImg: UIImageView!
@IBOutlet weak var category: UILabel!
@IBOutlet weak var location: UILabel!
@IBOutlet weak var title: UILabel!
@IBOutlet weak var price: UILabel!
var prices = String()
var notes = String()
var comments = String()
var locations = String()
var categories = String()
var school = String()
var username = String()
var date = String()


@IBAction func deleteAction(sender: AnyObject) {
    let request = NSMutableURLRequest(URL: NSURL(string: "http://www.percyteng.com/orbit/deletePost.php")!)
    request.HTTPMethod = "POST"
    let postString = "name=\(username)&location=\(locations)&price=\(prices)&notes=\(notes)&school=\(school)&category=\(categories)"
    request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)

    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
        data, response, error in

        if error != nil {
            print("error=\(error)")
            return
        }

        print("response = \(response)")

        let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
        print("responseString = \(responseString)")
    }
    task.resume();           NSNotificationCenter.defaultCenter().postNotificationName("NotificationIdentifie‌​r", object: nil)


}

override func awakeFromNib() {
    super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated:animated)
}
}

And the tableview i want to reload data of in another class:

override func viewDidLoad() {
    super.viewDidLoad()
    username = tempUser.username
    self.resultSearchController = ({
        let controller = UISearchController(searchResultsController: nil)
        controller.searchResultsUpdater = self
        controller.dimsBackgroundDuringPresentation = false
        controller.searchBar.sizeToFit()
        self.tableView.tableHeaderView = controller.searchBar

        return controller

    })()
    get{(value) in
        self.values = value
        for ele in self.values{
            if self.username != ele["username"] as! String{
            }
        }
    }
    self.tableView.reloadData()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(serviceBoard.methodhandlingTheNotificationEvent), name:"NotificationIdentifie‌​r", object: nil)

}

func methodhandlingTheNotificationEvent(){
    tableView.reloadData()
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if (self.resultSearchController.active && resultSearchController.searchBar.text != "") {
        return self.filteredTableData.count
    }
    else {
        return values.count
    }
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as!postCell
    let maindata = values[values.count-1-indexPath.row]

    if (self.resultSearchController.active && resultSearchController.searchBar.text != "") {


        //            if (filteredTableData[indexPath.row].rangeOfString("###") == nil){
        cell.postImg.image = UIImage(named:"tile_services")
        cell.title.text = filteredTableData[indexPath.row]
        cell.category.text = "SERVICES"
        var price = String()
        for i in values{
            if (i["title"] as? String)! == filteredTableData[indexPath.row]{
                price = (i["price"] as? String)!
                cell.categories = "Services"
                cell.username = i["username"] as! String
                cell.prices = i["price"] as! String
                cell.notes = i["notes"] as! String
                cell.school = i["school"] as! String
            }
        }
        cell.price.text = price 

        return cell
    }
    else {
        if maindata["username"] as! String != username && username != "admin"{
            cell.deleteBtn.hidden = true
        }
        else{
            cell.categories = "Services"
            cell.username = maindata["username"] as! String
            cell.prices = maindata["price"] as! String
            cell.notes = maindata["notes"] as! String
            cell.school = maindata["school"] as! String
        }

        cell.postImg.image = UIImage(named:"tile_services")
        cell.title.text = maindata["title"] as? String
        cell.category.text = "SERVICES"
        cell.price.text = maindata["price"] as? String

        return cell
    }
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("showPostT") as! showPostT
    self.addChildViewController(popOverVC)
    popOverVC.view.frame = self.view.frame
    self.view.addSubview(popOverVC.view)
    popOverVC.didMoveToParentViewController(self)
    if (self.resultSearchController.active && resultSearchController.searchBar.text != "") {
        for i in values{
            if (i["title"] as? String)! == filteredTableData[indexPath.row]{
                popOverVC.type.text = "SERVICE"
                popOverVC.typeImg.image = UIImage(named:"tile_services")
                popOverVC.item.text = "Service: \(i["title"] as! String)"
                popOverVC.price.text = "Price: \(i["price"] as! String)"
                popOverVC.notes.text = "Notes: \(i["notes"] as! String)"
                popOverVC.comments.text = i["comments"] as? String
                popOverVC.postUser.text = i["username"] as! String
                popOverVC.notesStr = i["notes"] as! String
                popOverVC.category = "service"
                popOverVC.pricesStr = i["price"] as! String
                if username == popOverVC.postUser.text!{
                    popOverVC.composeBtn.hidden = true
                }
            }
        }
    }
    else{
        let maindata = values[values.count-1-indexPath.row]
        popOverVC.type.text = "SERVICE"
        popOverVC.typeImg.image = UIImage(named:"tile_services")
        popOverVC.item.text = "Service: \(maindata["title"] as! String)"
        popOverVC.price.text = "Price: \(maindata["price"] as! String)"
        popOverVC.notes.text = "Notes: \(maindata["notes"] as! String)"
        popOverVC.comments.text = maindata["comments"] as? String
        popOverVC.postUser.text = maindata["username"] as! String
        popOverVC.notesStr = maindata["notes"] as! String
        popOverVC.category = "service"
        popOverVC.pricesStr = maindata["price"] as! String

        if username == popOverVC.postUser.text!{
            popOverVC.composeBtn.hidden = true
        }
    }

}

I don't think I need code for my second question, I simply want to know how to refresh a view controller. I tried to close the current controller and reopen it, but it obviously doesn't work.

I would really appreciate if you guys can help any of the questions!

Thank you!

Answer 1

Well , First of all, if you want to refresh the tableview data you must notify it, so it knows if there are any changes in the model. If you want to reload the whole table view (I strongly advised not to do it) you can use

 tableView.reloadData()

If you want to refresh certain rows use the following methods:

tableView.reloadRowsAtIndexPaths(paths, withRowAnimation: UITableViewRowAnimation.None) 

Or you could use this method only for delete action. Observe the tap on button event and send signal to the tableView to delete the row. When the tableView receive this signal, just pass execute the following method.

 tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)

forcing redraw of your custom view : view.setNeedsDisplay()

Answer 2

Reload tableview data

[_tableView reloadData];