scrollView is nil when called from viewdidload

I want to scrolling view when navigationItem clicked. But..here is some error.

1. I want to make snapchatlike scroll view. It works fine, but... when I call scrollView out of viewdidload function, scrollView is nil!

2. I already make snapchat like swipe view. but I want to make swipe view when navigation Item(heart mark) clicked.

My ViewController viewdidload func - it works fine

@IBOutlet weak var scrollView: UIScrollView!


var V1 : LeftViewController = LeftViewController(nibName: "LeftViewController", bundle: nil)
var V2 : CenterViewController = CenterViewController(nibName: "CenterViewController", bundle: nil)
var V3 : RightViewController = RightViewController(nibName: "RightViewController", bundle: nil)



override func viewDidLoad() {

    super.viewDidLoad()



    self.addChildViewController(V1)
    self.scrollView.addSubview(V1.view)
    V1.didMoveToParentViewController(self)

    self.addChildViewController(V2)
    self.scrollView.addSubview(V2.view)
    V2.didMoveToParentViewController(self)

    self.addChildViewController(V3)
    self.scrollView.addSubview(V3.view)
    V3.didMoveToParentViewController(self)

    var V2Frame : CGRect = V2.view.frame
    V2Frame.origin.x = self.view.frame.width
    V2.view.frame = V2Frame


    var V3Frame : CGRect = V3.view.frame
    V3Frame.origin.x = 2 * self.view.frame.width
    V3.view.frame = V3Frame

    println(self)
    println(scrollView)
    println(V2.view.frame)

    self.scrollView.setContentOffset(CGPointMake(V2Frame.origin.x, self.view.frame.size.height), animated: false)



    self.scrollView.contentSize = CGSizeMake(self.view.frame.width * 3, self.view.frame.size.height)        }

My ViewController clickEvent func - why scrollView is nil?

    func clickEvent() {
    V2.view.frame = CGRect(x: 375.0, y: 0.0, width: 320.0, height: 568.0)
    let scrollView = UIScrollView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 568.0))


    self.scrollView?.scrollRectToVisible(V2.view.frame, animated: true)

    println(self)
    println(scrollView)
    println(V2.view.frame)
    //self.scrollView.setContentOffset(CGPointMake(V2.view.frame.origin.x, self.view.frame.size.height), animated: true)
}

I call clickEvent in Viewcontroller from other CenterViewController - it can call fine but...in ViewController clickEvent functions' scrollView is nil.. How can I fix it?

func clickEvent(sender: AnyObject) {

   ViewController().clickEvent()
}

via Chebli Mohamed