Counting found objects in PFTableQueryViewController - ios

Question

I am trying to count the number of the found objects in PFQueryTableViewController.
I have tried working around with
override func queryForTable() -> PFQuery {
let query = PFQuery(className: self.parseClassName!)
query.whereKey("member", equalTo: memberId!)
let count = query.countObjectsInBackground()
label.text = "\(count)"
return query
}
But my app will crash.
EDIT:
The issue is not to make a query and count it's objects. The problem is to use queryForTable passing my query to cellForRowAtIndexPath of my PFQueryTableViewController
the cellForRowAtIndexPath looks like this:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell? {
let cell:DetailApplicantCell = self.table.dequeueReusableCellWithIdentifier("reuseIdentifier") as! DetailApplicantCell
if let name = object?.objectForKey(self.textKey!) as? String{
cell.nameLbl.text = name
}
cell.groupImage.image = UIImage(named: "People.png")
if let imageFile = object?.objectForKey(self.imageKey!) as? PFFile{
cell.groupImage.file = imageFile
cell.groupImage.loadInBackground()
}
return cell
}
NOTE that this is not the default cellForRow

Answer 1

Try with query.findObjectsInBackgroundWithBlock method and get the size() of the response object
let query = PFQuery(className: self.parseClassName!)
query.whereKey("member", equalTo: memberId!)
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
let count = objects.size()
label.text = "\(count)"
if let object = objects as? [PFObject] {
}
} else {
// Log details of the failure
print("Error: \(error!)")
}
}

Answer 2

You are force unwrapping at 2 places, use if let:
func queryForTable() -> PFQuery? {
if let parseClass = self.parseClassName {
let query = PFQuery(className: parseClass)
if let id = memberId {
query.whereKey("member", equalTo: id)
}
let count = query.countObjectsInBackground()
label.text = "\(count)"
return query
}
return nil
}
Then you use your function like:
if let query = queryForTable() {
//your query related code here.
}

Answer 3

Rather than doing a second PFQuery I found a better way using a method of PFQueryTableViewController like this:
override func objectsDidLoad(error: NSError?) {
super.objectsDidLoad(error)
print("objectsDidLoad")
if let results = self.objects{
print("objectsFound")
self.groupsCountLbl.text = "\(results.count)"
self.groupsCountLbl.fadeIn()
}
}
The VC has a property objects an array of AnyObject?.
With the objectsDidLoad function you determine the time, everything is loaded.