Re-accessing random data between methods in ViewController - ios

Question

For my Swift app, I want the data accessed in the didReceiveMemoryWarning function to be from the same random column of data retrieved from the viewDidLoad function, which was done with let randNumber = Int(arc4random_uniform(UInt32(count))). My app is a poll app where users can vote for different poll options then when they click the "Next" button, it takes them to another poll at random. The code under the didReceiveMemoryWarning function is for adding the vote (and retrieving it) from a poll, but I need that poll to be the same one displayed by the viewDidLoad function. How do I do that? For some reason no matter what poll I retrieve (crepes or pancakes, Coke or Pepsi, chocolate or vanilla, etc.) it only adds votes to and retrieves the results from the "crepes or pancakes" poll. Like if the user gets the poll "Coke or Pepsi" and they select Coke, it'll add a vote to the crepes vote count and retrieve the results from that poll. How do I retrieve data from the poll that is retrieved?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var query = PFQuery(className: "VoteCount")
query.countObjectsInBackgroundWithBlock {
(count: Int32, error: NSError!) -> Void in
if error == nil {
let randNumber = Int(arc4random_uniform(UInt32(count)))
query.whereKey("pollNumber", equalTo: randNumber)
query.getFirstObjectInBackgroundWithBlock {
(voteCount1: PFObject!, error: NSError!) -> Void in
if error != nil {
NSLog("%#", error)
} else {
let votes = voteCount1["votes"] as Int
let votes2 = voteCount1["votes2"] as Int
let option1 = voteCount1["optionName"] as String
let option2 = voteCount1["optionName2"] as String
self.showOption1.text = "\(option1)"
self.showOption2.text = "\(option2)"
}
}
} else {
println("error \(error)")
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBOutlet weak var pollResults: UILabel!
#IBAction func addVote1(sender: AnyObject) {
for button in self.buttons {
button.enabled = false
}
var query = PFQuery(className: "VoteCount")
query.getFirstObjectInBackgroundWithBlock {
(voteCount1: PFObject!, error: NSError!) -> Void in
if error != nil {
NSLog("%#", error)
} else {
voteCount1.incrementKey("votes")
voteCount1.saveInBackgroundWithTarget(nil, selector: nil)
let votes = voteCount1["votes"] as Int
let votes2 = voteCount1["votes2"] as Int
self.pollResults.text = "\(votes) \(votes2)"
}
}
}

Answer 1

You could make randomNumber a property instead of a local variable. However I think what you're actually trying to do is make sure you access the same PFObject in your later methods as you do in viewDidLoad. To do this, you don't need to re-fetch from Parse. Just keep a reference to the PFObject:
var voteCount : PFObject?
And in your completion block in viewDidLoad:
(voteCount1: PFObject!, error: NSError!) -> Void in
if error != nil {
NSLog("%#", error)
} else {
self.voteCount = voteCount1
// The rest of your code...
let votes = voteCount1["votes"] as Int
Then, later on, instead of fetching again, you just use the voteCount property:
#IBAction func addVote1(sender: AnyObject) {
for button in self.buttons {
button.enabled = false
}
voteCount.incrementKey("votes")
voteCount.saveInBackgroundWithTarget(nil, selector: nil)
let votes = voteCount["votes"] as Int
let votes2 = voteCount["votes2"] as Int
self.pollResults.text = "\(votes) \(votes2)"
}