how to make a video loop Swift

Question

pretty new to swift, couldn't find the way to make my video loop while it ends. can someone help me with the right functions? much appreciated.

class ViewController: UIViewController {
    var videoPlayer:AVPlayer?
    var videoPlayerLayer:AVPlayerLayer?
    override func viewDidLoad() {
        super.viewDidLoad()     
        setUpElements()
    }
    override func viewWillAppear(_ animated: Bool) {
        setUpVideo()
    }
    func setUpVideo() {
        let bundlePath = Bundle.main.path(forResource: "loginbg", ofType: "mp4")
        guard bundlePath != nil else {
            return
        }
        let url = URL(fileURLWithPath: bundlePath!)
        let item = AVPlayerItem(url: url)
        videoPlayer = AVPlayer(playerItem: item)
        videoPlayerLayer = AVPlayerLayer(player: videoPlayer!)           
        videoPlayerLayer?.frame = CGRect(x: -self.view.frame.size.width*1.5, y: 0, width: self.view.frame.size.width*4, height: self.view.frame.size.height)           view.layer.insertSublayer(videoPlayerLayer!, at: 0)
        videoPlayer?.playImmediately(atRate: 1)