UIScrollView cannot display image either in Portrait or Landscape mode

I have created a VC with orientation in Landscape in storyboard

I have added an UIIScrollView in it , say, make it: (w)1000, 500 (h) in the VC.

What I wanted to do:

1) Scrolling the image (with high resolution like 1334 x 750) inside ScrollView
2) view the image in ScrollView in landscape mode

To make ScrollView to display the image, I have to do it in `viewDidAppear` 

but here the Problems:

1) The Width and height of the `ScrollView` is gone
 
2) label on top gone.

3) The `ScrollView` Size become small something like 200 x 150 and start from the Top corner like (0,0) 


What I need to do to make `scrollview` size like before 1000 x 500?


--- Update -- 



class ViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var myUIScrollView: UIScrollView!  

    var imgView: UIImageView!

    override func viewDidLoad() {

        super.viewDidLoad()

        //-- force to landscape mode:

        let value = UIInterfaceOrientation.LandscapeLeft.rawValue
        UIDevice.currentDevice().setValue(value, forKey: "orientation")


        self.myUIScrollView.maximumZoomScale = 10.0
        self.myUIScrollView.minimumZoomScale = 1.0
        self.myUIScrollView.delegate = self


        imgView = UIImageView(image: UIImage(named: "MyPhoto.png"))


    }


 override func viewDidAppear(animated: Bool) {

     self.myUIScrollView.contentSize = imgView.bounds.size

     self.myUIScrollView.addSubview(imgView)

     view.addSubview(myUIScollView)
}


    override func shouldAutorotate() -> Bool {

            return true
     }


    func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
        return imgView
    }

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