How to count rows in a Parse class programmatically in an iOS app using swift?

Question

I have a parse back end for my iOS app. I have a parse class called \"quiz\". How can I read the number of rows in the Parse class, I have to use it in my iOS app?

Answer 1

Since the count is retrieved asynchronously, the way to return the count is inside a completion closure instead of using return cnt.

Here is an example:

func countObjectsWithCompletion(completion: (Int?)->(Void))
{
    var query = PFQuery(className:"quiz")
    query.findObjectsInBackgroundWithBlock {
        (objects: [PFObject]?, error: NSError?) -> Void in
        if error == nil
        {
            // The find succeeded.
            print("Successfully retrieved \(objects!.count) scores.")
            completion(objects!.count)
        } else {
            // Log details of the failure
            print("Error: \(error!) \(error!.userInfo)")
            completion(nil)
        }
    }
}

countObjectsWithCompletion { (myObjectCount: Int?) in
    if let cnt = myObjectCount {
        print("count is \(cnt)")
    } else {
        print("error getting count")
    }
}