Hitball | Hit the ball to keep it in air | Augmented Reality library

import UIKit

import GameKit

class ViewController: UIViewController {

let poolBalls = [Int](1...8)
var shuffledPoolBalls = [Int]()

@IBOutlet weak var numLab1: UILabel!
@IBOutlet weak var numLab2: UILabel!
@IBOutlet weak var numLab3: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func hitBalls(_ sender: UIButton) {
    generateNumbers()
}

func generateNumbers() {
    shuffledPoolBalls = GKRandomSource.sharedRandom().arrayByShufflingObjects(in: poolBalls) as! [Int]
    numLab1.text = String(shuffledPoolBalls[0])
    numLab2.text = String(shuffledPoolBalls[1])
    numLab3.text = String(shuffledPoolBalls[2])

}