parse add multiple images to an array after loop - ios

Question

I have an item Object which has a relation class which contain several images related to the item. The problem is I'm trying to add these images to an array so first inside the loop I'm adding them to one array and after the loop I'm adding them to the image Array and then when the loop is completed I want to reload table View. At the moment it seems like
Self.imageArray.addObject(imageDic)
is being called before the loop and therefor nothing is added to the array.
How can I do this?
var relation = itemObject.relationForKey("file") as PFRelation
var imageQuery = relation.query() as PFQuery
imageQuery.findObjectsInBackgroundWithBlock { (imageObj: [AnyObject]!, error1: NSError!) -> Void in
if error1 == nil {
var imageDic = NSMutableArray()
for obj in imageObj {
var imageObject = obj as PFObject
var thumbnail = imageObject.objectForKey("file") as PFFile
thumbnail.getDataInBackgroundWithBlock {
(imageData: NSData!, error: NSError!) -> Void in
if error == nil {
let image = UIImage(data:imageData)
imageDic.addObject(image)
}
}
}
self.imageArray?.addObject(imageDic)
println(self.imageArray?.count)
}
}
self.tableView?.reloadData()
}

Answer 1

See the block is called afterwards and your self.tableView?.reloadData() would be called before anything is added to it.
So I made cahnges in your code as below:-
var relation = itemObject.relationForKey("file") as PFRelation
var imageQuery = relation.query() as PFQuery
imageQuery.findObjectsInBackgroundWithBlock { (imageObj: [AnyObject]!, error1: NSError!) -> Void in
if error1 == nil {
var imageDic = NSMutableArray()
for obj in imageObj {
var imageObject = obj as PFObject
var thumbnail = imageObject.objectForKey("file") as PFFile
thumbnail.getDataInBackgroundWithBlock {
(imageData: NSData!, error: NSError!) -> Void in
if error == nil {
let image = UIImage(data:imageData)
// imageDic.addObject(image) //No need of this array.
self.imageArray?.addObject(imageDic)
println(self.imageArray?.count) //simply add object into this array.
}
}
}
self.tableView?.reload()
}
}
}