IPhone : NSMutableArray doesn't save Objects out side .observeEventType from Firebase api

Now my project is using https://www.firebase.com as backend for swift app. And i tried to addObject to my NSMutableArray variable in order to use it for my tablecell.

So i can Retrieving Data correctly inside . observeEventType() from their Api but outside that my NSMutableArray always empty here is my code

// Create a reference to a Firebase location

    var bidRef = Firebase(url:"https://xxxx.firebaseio.com/xxx")

    println("firebase test")

    // Read data and react to changes
    var handle = bidRef.queryOrderedByChild("tableCurrentPrice").observeEventType(.ChildAdded, withBlock: { snapshot in

        self.pubDataArray.addObject(snapshot.value)
        println(self.pubDataArray[0]["tableCurrentPrice"]) //Return Optional(Value)

    }, withCancelBlock: { error in
        println(error.description)
    })

    //bidRef.removeObserverWithHandle(handle)

    println(self.pubDataArray[0]["tableCurrentPrice"]) // Error empty array
    println(self.pubDataArray.count) // Return Nothing

Anyone knows how to fix this? Thanks!