Getting selected Item of WKInterfacePicker

I am trying to use a

WKInterfacePicker

to select a string from a list. As of now, I am using an

IBAction

function and am updating a variable that stores the value for the picker. The variable, however, does not get updated if I spin the digital crown too quickly, even though the selected element in the picker differs from the value of the variable. Additionally, the selected element when the view is first loaded, sometimes differs from the initial value of the variable (e.g. 0 is selected in the picker, but the value of the variable is 2). I believe that my

IBOutlets

and

IBActions

are wired up correctly in IB. Is this a bug in the beta software, or am I using the

WKInterfacePicker

incorrectly? Here is the code for the

WKInterfaceController

:

import WatchKit
import Foundation

class InterfaceController: WKInterfaceController {
    @IBOutlet var itemPicker:WKInterfacePicker?
    var pickerVal = 0


    override func awakeWithContext(context: AnyObject?) {
        super.awakeWithContext(context)      


        var itemArr = [WKPickerItem]()


        for n in 0...5 {
            let k = WKPickerItem()
            k.title = String(n)
            itemArr.append(k)
        }


        itemPicker?.setItems(itemArr)

        itemPicker?.setEnabled(false)
    }


    override func willActivate() {
    // This method is called when watch view controller is about to be visible to user
        super.willActivate()
        itemPicker?.setSelectedItemIndex(0)

        itemPicker?.setEnabled(true)
    }


    override func didDeactivate() {
        // This method is called when watch view controller is no longer visible
        super.didDeactivate()
    }


    @IBAction func itemPickerUpdated(index: Int) {
        pickerVal = index
    }
}