IOS Swift SpriteKit SKLabel, animate appearance of text

I want to to animate appearance of Label's text so that it looks like it is being typed in at the moment. I was wondering if there is a relatively easy way to do so in SWIFT. Thank you.

Try this:

class GameScene : SKScene {

    let text = ["G", "a", "m", "e"]

    var labelText = ""

    let labelNode = SKLabelNode()

    var calls : Int = 0

    var timer : NSTimer!

    override func didMoveToView(view: SKView) {

        timer = NSTimer.scheduledTimerWithTimeInterval(YOUR_DESIRED_INTERVAL, target: self, selector: #selector(self.updateLabelText), userInfo: nil, repeats: true)

        labelNode.text = labelText
        self.addChild(labelNode)
    }


    func updateLabelText() {

        labelText += text[calls]
        labelNode.text = labelText
        calls += 1

        if calls == text.count + 1 {
            timer.invalidate()
    }
}