CODEWITHSUNDEEP
iosswiftspinner
Adam Young
Adam Young

Reputation: 1331

Spinner not working in swift

I have added a spinner to my screen but it does not show. Here is my code pause spinner and play spinner

   func pause() {
    activityIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 50, 50))
    activityIndicator.center = self.view.center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
    view.addSubview(activityIndicator)
    activityIndicator.startAnimating()
    UIApplication.sharedApplication().beginIgnoringInteractionEvents()
}

Here is my restore method

func restore() {
    activityIndicator.stopAnimating()
    UIApplication.sharedApplication().endIgnoringInteractionEvents()
}

I have declared my spinner just inside the class

var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

Here is where I am calling the spinner

override func viewDidLoad() {

   // myarray = [""]
  // var take = NSMutableArray

    pause()
    var query = PFQuery(className:"Questions")
    query.whereKey("Level", equalTo:level)
    query.whereKey("Quiz", equalTo:quiz)
    query.orderByAscending("Ques")

    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]!, error: NSError!) -> Void in
        if error == nil {
            // The find succeeded.
            println("Successfully retrieved \(objects.count) scores.")

            var i = 0;

            if let objects = objects as? [PFObject] {
                for object in objects {
                    println(object.objectId)
                    let pf = object as PFObject
                    let name = pf["Question"] as String
                    ql.append(name)
                    if (flag1 == 0){
                    myarr.insert(name, atIndex: i)
                    i++;
                    }

                }
            }
            println(myarr);
        } else {
            // Log details of the failure

            println("Error: \(error) \(error.userInfo!)")
            self.performSegueWithIdentifier("error", sender: self)
            let defaults = NSUserDefaults.standardUserDefaults()
            defaults.setBool(false,forKey:"l"+String(level)+"q"+String(quiz))
            defaults.setBool(false,forKey:"l"+String(level)+"p")
        }
        dispatch_async(dispatch_get_main_queue(), {
            self.restore()
        })

    }
    if (flag1==0){
        ques = 1
    }
    questions()
    println(ql)


    super.viewDidLoad()

// Do any additional setup after loading the view. }

Upvotes: 1

Views: 1890

Answers (2)

zisoft
zisoft

Reputation: 23078

Your (probably long running) query runs as a background task so your restore() will be called immediately. You have to change 2 things:

  1. Put your call to restore() within the background execution block
  2. Keep "The Law" in mind: Updates to UI elements must be done in the main thread

So, for 2. you have to wrap restore() in the main thread:

dispatch_async(dispatch_get_main_queue(), {
    restore()
})

Upvotes: 1

emrys57
emrys57

Reputation: 6806

Your ActivityIndicator starts with your pause function and stops with your restore function. In viewDidLoad, most of the work is carried out by the block you have defined, which runs in the background. The time from pause to restore will be tiny. restore will run long before your block finishes executing.

If you want the spinner to run until the block finshes, you need to do something like

println("Successfully retrieved \(objects.count) scores.")
restore()

inside your block. But, beware, I am not sure what thread your block executes on, and I am not sure if it is correct to call restore from a background thread. You could try it.

Upvotes: 0

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