CODEWITHSUNDEEP
iosswiftparse-platformtableviewpfquery
Aidan Kaiser
Aidan Kaiser

Reputation: 521

Retrieving variable from outside completion block Parse Swift

I have an app that contains a table view. The table view is populated by data pulled from Parse. To get the number of rows that I want the TableView to be populated with, I query parse.

    var activeGamesCurrentUser = 0

    gamesQuery.countObjectsInBackgroundWithBlock({
            (count, error) -> Void in
            let countedInt = Int(UInt32(count))
            self.activeGamesCurrentUser = countedInt
        })

But, when I attempt to return activeGamesCurrentUser for the number of rows, it is always 0 because the variable doesn't update outside of the completion block. If I print "countedInt" inside of the block, it is a number greater than 0.

I do not want to solve the problem like this:

    var count = gamesQuery.countObjects()
    activeGamesCurrentUser = count

The reason for this is because "countObjects()" is synchronous and will continue running in the foreground forever. Any help regarding this issue will be appreciated.

Edit:

Here is the full method:

var activeGamesCurrentUser = 0

func getRowNumber() {
    if PFUser.currentUser() != nil && finished == true {
        currentUserObjectId = PFUser.currentUser()?.objectId
        let currentUser = PFUser.currentUser()

        let challengedQuery = PFQuery(className: "Games")
        challengedQuery.whereKey("challenged", equalTo:     currentUserObjectId)

        let challengerQuery = PFQuery(className: "Games")
        challengerQuery.whereKey("challenger", equalTo: (currentUser?.objectId)!)

        let gamesQuery = PFQuery.orQueryWithSubqueries([challengedQuery, challengerQuery])

        gamesQuery.countObjectsInBackgroundWithBlock({
            (count, error) -> Void in
            let countedInt = Int(UInt32(count))
            self.activeGamesCurrentUser = countedInt
        })

        }

     override func viewDidLoad() {
     super.viewDidLoad()


     getRowNumber()
     }
     func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {        

     return activeGamesCurrentUser
     }

Upvotes: 2

Views: 533

Answers (1)

Abhinav
Abhinav

Reputation: 38162

Couple of things -

First, always access class properties inside the block with a weak reference to self.

Second, reload table once you are done updating your model.

weak var aBlockSelf = self

gamesQuery.countObjectsInBackgroundWithBlock({
            (count, error) -> Void in
            let countedInt = Int(UInt32(count))
            aBlockSelf.activeGamesCurrentUser = countedInt
            aBlockSelf.tableView.reloadData()
        })

Upvotes: 3

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