Updating Parse array with local array data, Swift, UITableView

Question

When the tableview loads I retrieve the Parse Object "User", and load it into a userArray.

 func loadUserData(){


    var query = PFUser.query()


    query?.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]?, error: NSError?) -> Void in

        if error != nil {

            println(error)

        } else if let objects = objects as? [PFObject] {

            println(objects)


            // loop through results. print(results)
            for object in objects {
                self.userArray.addObject(object)


                // code to download an image
                let imageFile = object["image"] as! PFFile

                imageFile.getDataInBackgroundWithBlock {

                    (imageData: NSData?, error: NSError?) -> Void in
                    if error != nil {
                        println(error)
                    } else {

                        if let data = imageData {
                            self.images.append(UIImage(data: data)!)
                            self.tableView.reloadData()



                        }
                    }

                }

            }

            self.tableView.reloadData()
        }

    }

}

When a user selects a tableView cell, that PFUser.objectId is sent into an array of [selectedFriends], which is created at the top of the class.

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
     let cell = self.tableView.cellForRowAtIndexPath(indexPath)
    let row = indexPath.row
    let cellDataParse : PFObject = self.userArray.objectAtIndex(row) as! PFObject
    var user = userArray[row] as! PFUser
    var iD = user.objectId

    var selectedFriend = iD
    if cell?.selected == true {
    cell!.accessoryType = .Checkmark
        // change made here ----????
    selectedFriends.append(selectedFriend!)
    println(selectedFriends)

    }

    if cell?.selected == false && selectedFriends.count == 2 {
            selectedFriends.removeAtIndex(1)
        }


 if self.selectedFriends.count > 5 {

var alert = UIAlertController(title: "Team Maximum", message: "Max team size is 5 friends\n You can only choose maximum 4 friends for your team.", preferredStyle: UIAlertControllerStyle.Alert)

alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: { action in


    self.selectedFriends.removeLast()
    cell?.accessoryType = .None
    cell?.selected = false





    })

}

    }

At this point I can successfully select a indexPath.row, and add the objectId of the user into the array of selectedFriends (Which I declared at the top of my class).

My goal is to take all of the objectId's added into the array, and send them to a Parse array called "team".

Here is the code for this:

 func createNewTeam(){

    var user = PFUser.currentUser()
    if selectedFriends.count > 0 {
    user!.addObjectsFromArray([selectedFriends], forKey: "team")
    user!.saveInBackground()
    }
    tableView.reloadData()
    selectedFriends.removeAll(keepCapacity: true)
    println("something should have happend")
}

I then added this function to an action Button. When I pressed the button I got this error:

2015-09-09 12:52:56.651 Storm[11039:1498653] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Operation is invalid after previous operation.' * First throw call stack: ( 0 CoreFoundation 0x00000001023b3c65 exceptionPreprocess + 165 1 libobjc.A.dylib 0x00000001040cabb7 objc_exception_throw + 45 2 Storm 0x0000000100dc2ae3 -[PFAddOperation applyToValue:forKey:] + 0 3 Storm 0x0000000100dd73bd -[PFObject(Private) performOperation:forKey:] + 206 4 Storm 0x0000000100ddea53 -[PFObject addObjectsFromArray:forKey:] + 126 5 Storm 0x0000000100d64596 _TFC5Storm29SearchTeamTableViewController13createNewTeamfS0_FT_T_ + 486 6 Storm 0x0000000100d5ebe4 _TFC5Storm29SearchTeamTableViewController18nextButtonDidPressfS0_FPSs9AnyObject_T_ + 68 7 Storm 0x0000000100d5ecd6 _TToFC5Storm29SearchTeamTableViewController18nextButtonDidPressfS0_FPSs9AnyObject_T_ + 54 8 UIKit 0x0000000102dffd62 -[UIApplication sendAction:to:from:forEvent:] + 75 9 UIKit 0x0000000102dffd62 -[UIApplication sendAction:to:from:forEvent:] + 75 10 UIKit 0x0000000102f1150a -[UIControl _sendActionsForEvents:withEvent:] + 467 11 UIKit 0x0000000102f108d9 -[UIControl touchesEnded:withEvent:] + 522 12 UIKit 0x0000000102e4c958 -[UIWindow _sendTouchesForEvent:] + 735 13 UIKit 0x0000000102e4d282 -[UIWindow sendEvent:] + 682 14 UIKit 0x0000000102e13541 -[UIApplication sendEvent:] + 246 15 UIKit 0x0000000102e20cdc _UIApplicationHandleEventFromQueueEvent + 18265 16 UIKit 0x0000000102dfb59c _UIApplicationHandleEventQueue + 2066 17 CoreFoundation 0x00000001022e7431 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 18 CoreFoundation 0x00000001022dd2fd __CFRunLoopDoSources0 + 269 19 CoreFoundation 0x00000001022dc934 __CFRunLoopRun + 868 20 CoreFoundation 0x00000001022dc366 CFRunLoopRunSpecific + 470 21 GraphicsServices 0x000000010647ea3e GSEventRunModal + 161 22 UIKit 0x0000000102dfe8c0 UIApplicationMain + 1282 23 Storm 0x0000000100d4c117 main + 135 24 libdyld.dylib 0x0000000104800145 start + 1 25 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException

I apologize. This is a lot to read. This is also my first post on stack overflow. Could someone help???

Lamour Lamour · Accepted Answer · 2015-09-09T23:37:42

Your query method is not efficient because you only downloaded images but again into the didSelectRowAtIndexPath method you tried to get the user objectID from it. However you should have create a struct outside of the Controller View class that will contain the userid and the user's image.

your query function will now look like :

struct ModelStructure
{
var id:String!
var images:UIImage!
}

Inside of the Controller class

var arrayofData = [ModelStructure]()  // create an array of that structure 

  func loadUserData()
  {
      var query = PFQuery(className: "")
 query.findObjectsInBackgroundWithBlock { (objects: [AnyObject]?, error: NSError?) -> Void in
    if error != nil
    {
        println(error)
    }
    else
    {
       if let objects = objects as? [PFObject]
       {
           for object in objects
           {
               var imageFile = object["image"] as! PFFile
               imageFile.getDataInBackgroundWithBlock {(imageData: NSData?, error: NSError?) ->Void in
                if error != nil
                {
                    println(error)
                }
                else
                {
                        if let data = imageData
                         {
                           var imagesToget = UIImage(data: data)
                            var oneModel = ModelStructure()
                            oneModel.id = object.objectId
                            oneModel.images = imagesToget
                            self.arrayofData.append(oneModel)
                            self.tableView.reloadData()
                        }
                }

               }
            }
        }

    }

    }

 }

In the didSelectRowAtIndexPath you have this + what you wanted to do

  var cell = tableView.cellForRowAtIndexPath(indexPath)
    var data = self.arrayofData[indexPath.row]
    if cell?.selected == true {
        // add accessory
        cell?.accessoryType = UITableViewCellAccessoryType.Checkmark
        print("row that are being selected \(indexPath.row) \n")
        var selectUser = data.id
        self.selectedArray.append(selectUser)

    }

Updating Parse array with local array data, Swift, UITableView

1 Answers