iOS 8 upside down orientation, XCode option enabled, still doesn't work

Question

I have a universal application being developed in iOS8 (XCode 6.1.1). It will support all the 4 orientations (left, right, portrait & upside down).

The problem i

Answer 1

With Swift 2.1, you can simplify @Cleversou’s answer to:

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask
{
  return .All
}

With Swift 2.3

override var supportedInterfaceOrientations : UIInterfaceOrientationMask {
  return .all
}