Array index out of range. Swift. Table View - arrays

Question

I got a fatal error: Array index out of range. The error comes from let profilePicture = tempProductPictureArray[count] when tempProductPictureArray[count] is nil. I am wondering do I set something wrong on imageArray?
var imageArray = [[PFFile]]()
........
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func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{
let cell:MarketTableViewCell = tableView.dequeueReusableCellWithIdentifier("MarketCell") as! MarketTableViewCell
let tempProductPictureArray = imageArray[indexPath.row]
// tempProductPictureArray.count is something like [nil / PFFile(image), nil / PFFile(image) .....]
if tempProductPictureArray.count != 0 {
var hasImage = false
var count = 0
while hasImage == false {
let profilePicture = tempProductPictureArray[count]
if profilePicture != nil {
profilePicture!.getDataInBackgroundWithBlock { data, error in
if error != nil {
self.appDelegate.displayMyAlertMessage((error?.localizedDescription)!, userVI: self)
} else {
cell.productImage.image = UIImage(data: data!)
}
}
hasImage = true
} else if count == tempProductPictureArray.count {
cell.productImage.image = UIImage(named: "Profile Picture")
} else {
count += 1
}
}
} else {
cell.productImage.image = UIImage(named: "Profile Picture")
}
data source
func refreshResults(){
...
...
...
sameObjectInQuery.findObjectsInBackgroundWithBlock{ (sameObjects: [PFObject]?, error: NSError?) -> Void in
for var i = 0; i <= tempUniqueTitle.count - 1; i++ {
tempProductImage = [PFFile]()
for sameobject in sameObjects! {
if sameobject.objectForKey("detailsImage") != nil {
tempProductImage.append(sameobject.objectForKey("detailsImage") as? PFFile)
} else {
tempProductImage.append(nil)
}
imageArray.append(tempProductImage)
}
....

Answer 1

Trace through your code, assuming that tempProductPictureArray contains one item. tempProductPictureArray.count will be 1 and that item is at offset 0. Presumably, it's a nil optional and you want to skip over it.
Since count is not equal to tempProductPictureArray.count, you add one to count and try to fetch something from the array at that location (offset 1). However, we've said the only element in the array is at offset 0, so...crash.
You need to make sure that count is always less than tempProductPictureArray.count.