Swift: UICollectionView & UIImage fatal error: Array index out of range - swift

Question

Hi Im new to swift and need some help thank you. The program worked once, tried to run it again then it crashed. The items are in the array when I debugged but when I try to display the images I get the fatal error.
// Get Brands
func getBrand () {
// Create PFQuery
var query:PFQuery = PFQuery(className: "BrandInfo")
// Call findobjects
query.findObjectsInBackgroundWithBlock {
(objects:[AnyObject]?, error: NSError?) -> Void in
// refresh array
self.brands = [String]()
self.pics = [UIImage]()
// loop through array
for brandObject in objects! {
// get PFObjects
let brandName:String? = (brandObject as! PFObject)["Name"] as? String
if brandName != nil {
self.brands.append(brandName!)
}
let brandPicture = brandObject["Image"] as! PFFile
brandPicture.getDataInBackgroundWithBlock({ (imageData:NSData?, error:NSError?) -> Void in
if(error == nil){
let brandImage = UIImage(data: imageData!)
self.pics.append(brandImage)
println(self.pics.count)
}
})
}
// Refresh CollectionView
self.collectionView.reloadData()
}
}
// Setting up collection view
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.brands.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell:collectionViewCell = self.collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! collectionViewCell
// Get elements
let picToDisplay:UIImage? = pics[indexPath.row] // this is the error line
let dataToDisplay:String = brands[indexPath.row]
let imageView:UIImageView? = cell.viewWithTag(2) as? UIImageView
// Set labels
cell.brandImage.image = picToDisplay
cell.brandLabel.text = dataToDisplay
return cell
}
///////////////////////////////
struct brandCollection {
var brandText:[String] = [String]()
var brandImage:[UIImage?] = [UIImage]()
}

Answer 1

You have brands.count items, and you need brand.count images. But you are using a different array pics which will fail if it has less elements than brands. Looking at your code, there are several possibilities why this could happen.
This is bad design. You should have a data array that encapsulates all the information you need. Each image should be connected to its object (the brand), not held in some other array.