Set orientation of single page to landscape for ios

Hello,

I have implemented single page rotation to landscape in android using OnWindowVisibilityChanged method in renderer for specific page.

But I couldn't figure it out for ios.

My code for iOS renderer is below.

`[assembly: ExportRenderer(typeof(Page3), typeof(CustomContentPageRenderer))]
namespace PhotoPages.iOS
{
public class CustomContentPageRenderer : PageRenderer
{
// App.IsPortrait is public static variable declared in App.cs and set to false in Page3 Constructor

    // This method returns landscape mode but somehow page is not rotated.
    public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations()
    {
        return App.IsPortrait ? UIInterfaceOrientationMask.Portrait : UIInterfaceOrientationMask.LandscapeLeft;
    }
    public override void ViewDidAppear(bool animated)
    {
        base.ViewDidAppear(animated);
        App.IsPortrait = true;
    }
    //public override bool ShouldAutorotate()
    //{
    //  return true;
    //}
    //public override UIInterfaceOrientation PreferredInterfaceOrientationForPresentation()
    //{
    //  return UIInterfaceOrientation.LandscapeRight;
    //}
    //protected override void OnElementChanged(VisualElementChangedEventArgs e)
    //{
    //  base.OnElementChanged(e);
    //  this.PreferredInterfaceOrienttionForPresentation();
    //  if(App.IsPortrait == false)
            // This rotates to landscape but not single page.. it rotates all pages.
    //      UIDevice.CurrentDevice.SetValueForKey(new NSNumber((int)UIInterfaceOrientation.LandscapeRight), new NSString("orientation"));
    //  else
    //      UIDevice.CurrentDevice.SetValueForKey(new NSNumber((int)UIInterfaceOrientation.Portrait), new NSString("orientation"));
    //}
}

}`

And one more thing to mention...
If I write GetSupportedInterfaceOrientations in AppDelegate.cs then my app stops working and my device is switched off automatically.
I am testing in `iPhone 5s' version 9.3.2.

Please Help !

Thank you.