Array out of index when getting PFFile from Parse - swift

Question

My app gets the images just fine but if I scroll up and down for a while and then pull to refresh, it crashes and says array out of index. This does not happen every time. I believe it has something to do with the fact that I am not using getdatainbackground but when I go to use that instead of getData(), it loops faster than it can actually retrieve the files and they are out of order.
My current code also gives me this error: Break on warnBlockingOperationOnMainThread() to debug.
2016-03-02 00:35:48.630 App Name[1137:96655] Warning: A long-running operation is being executed on the main thread.
if Reachability.isConnectedToNetwork() {
self.skip = 0
//--RESETTING THE ARRAYS FOR DATA--\\
self.contactText.removeAll(keepCapacity: true)
self.names.removeAll(keepCapacity: true)
self.images.removeAll(keepCapacity: true)
self.prices.removeAll(keepCapacity: true)
self.sizes.removeAll(keepCapacity: true)
self.conditions.removeAll(keepCapacity: true)
self.dates.removeAll(keepCapacity: true)
self.ids.removeAll(keepCapacity: true)
self.createdBy.removeAll(keepCapacity: true)
//--RESET THE USERS LOCATION WHEN HE REFRESHES IN CASE OF A DARASTIC MOVE IN LOCATION--\\
let userGeoPoint = PFUser.currentUser()!["location"] as! PFGeoPoint
//--GETTING ALL OF THE OBJECTS WITHIN 60 MILES OF USERS CURRENT LOCATION--\\
let query = PFQuery(className:"Shoes")
query.whereKey("Location", nearGeoPoint: userGeoPoint, withinMiles: 60)
let user = PFUser.currentUser() as PFUser!
let array: AnyObject? = user["blockedUsers"]
if(array != nil){
query.whereKey("createdBy", notContainedIn: array! as! [AnyObject])
}
query.limit = 50
query.orderByDescending("createdAt")
query.skip = self.skip
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
print("Successfully retrieved \(objects!.count) scores.")
for object in objects! {
if let dateCreated = object.createdAt as NSDate? {
self.dates.append(dateCreated)
}
self.contactText.append(object["Contact"] as! String)
self.descriptions.append(object["Description"] as! String)
self.names.append(object["Name"] as! String)
if object["price"] as! String == "" || object["price"] == nil{
self.prices.append("Negotiable")
}else{
self.prices.append(object["price"] as! String)
}
if object["size"] as! String == "" || object["size"] == nil{
self.sizes.append("N/A")
}else{
self.sizes.append(object["size"] as! String)
}
if object["conditionType"] as! String == "" || object["conditionType"] == nil{
self.conditions.append("N/A")
}else{
self.conditions.append(object["conditionType"] as! String)
}
self.ids.append(object.valueForKey("objectId") as! String)
self.createdBy.append(object["createdBy"] as! String)
let imageFile = object["imageFile"] as! PFFile
let imageData = imageFile.getData()
if (imageData != nil) {
let image = UIImage(data:imageData!)
self.images.append(image!)
}
}
dispatch_async(dispatch_get_main_queue(), {
self.tableView.reloadData()
})
}
else {
print(error)
}
self.refresher.endRefreshing()
}
self.skip+=50
} else {
print("Internet connection not available")
self.refresher.endRefreshing()
let alert = UIAlertView(title: "No Internet connection", message: "Please ensure you are connected to the Internet", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}

Answer 1

Try adding a check to make sure your arrays aren't empty when assigning data to cells.