Data retrieval using Parse in Swift 2 - ios

Question

I did this for fetching data and showing it in a table view
but it's not showing anything.
I used this code:
import UIKit
import Parse
import Bolts
class Parsedata: UIViewController, UITableViewDelegate, UITableViewDataSource {
//#IBOutlet var NTableView: UITableView!
#IBOutlet var NTableView: UITableView!
var NArray:[String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.NTableView.delegate = self
self.NTableView.dataSource = self
// retrieve notification from parse
self.RetrieveN()
NSLog("Done with it")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func RetrieveN () {
//create a pfquery
var query:PFQuery = PFQuery(className: "Notification")
//call findobject in background
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
//clear the Narray
self.NArray = [String]()
//loop through the objects array
for Nobject in objects!{
//retrieve the text column value of each PFobject
let Ntext:String? = (Nobject as! PFObject) ["Text"] as? String
// assign it into your Narray
if Ntext != nil {
self.NArray.append(Ntext!)
}
}
if error == nil {
// The find succeeded.
print("Successfully retrieved \(objects!.count) Notifications.")}
//reload the table view
self.NTableView.reloadData()
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.NTableView.dequeueReusableCellWithIdentifier("NCell") as UITableViewCell?
cell?.textLabel?.text = self.NArray[indexPath.row]
return cell!
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return NArray.count
}
}
It's working fine because it's showing that 3 objects were retrieved on the LOG container.

Answer 1

Unless you have more code than what's posted here, you also need to implement numberOfSectionsInTableView and return 1

Answer 2

I have just learnt how to do this myself, this is how you can load data from parse and save it as a NSMutableArray then use that data to populate your table view.
let NArray : NSMutableArray = NSMutableArray()
then you can use your query you made with
var query:PFQuery = PFQuery(className: "Notification")
query.findObjectsInBackgroundWithBlock( { (AnyObject objects, NSError error) in
if error == nil {
self.NArray = NSMutableArray(array: objects!)
self.NTableView.reloadData()
} else {
print(error?.localisedDescription)
})
this will load all your content into the variable NArray, which you can then use in your tableView function with indexPath. That line of code inside your tableView cellForRowAtIndexPath would be
cell?.textLabel?.text = self.NArray[indexPath.row] //you may have to cast this as? String
Like i said this is how i am loading my data, i am using this to load PFUser usernames, profile pictures etc and displaying them in a custom table view cell.
You may have to slightly tweak these methods but the base methods are there