Only support for landscape Interface orientation

Programmer Question

I have application that uses landscape right orientation.
In view controllers I use:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
  // Return YES for supported orientations
  return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}

But, If user locks iphone or ipad to portrait orientation, screen is displayed
as portrait, not landscape. Also, in info.plist file I defined only Landscape orientation as
supported one.

Find the answer here