Question

I need to know when orientation switch from portrait to landscape and vise versa.
If I choose to listen to UIDeviceOrientationDidChangeNotification I get face up, face down etc, but I need to run code only when there is a interface rotation.

I could do as http://the.ichibod.com/kiji/how-to-handle-device-rotation-for-uiviews-in-ios/

- (void)deviceOrientationDidChange:(NSNotification *)notification {

 //Obtaining the current device orientation
  UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

 //Ignoring specific orientations
  if (orientation == UIDeviceOrientationFaceUp || orientation == UIDeviceOrientationFaceDown     || orientation == UIDeviceOrientationUnknown || currentOrientation == orientation) {
   return;
  }

  [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(relayoutLayers) object:nil];
  //Responding only to changes in landscape or portrait
  currentOrientation = orientation;
}

What is the best approach?

Answer 1

I had similar problems orientating my views when using device orientation. It has up, down, left and right but also unknown and another which I yet to figure it out what it means (int 5 on the enum, 0 being Unknown). Anyways, what I ended up resorting to was to detect the status bar orientation. That remains more consistency for what the user is seeing.

UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];

Hope this helps.