Orientation Changed Notification

Orientation Changed Notification

Add to #AppDelegate.m didFinishLaunchingWithOptions

	//----- SETUP DEVICE ORIENTATION CHANGE NOTIFICATION -----
	UIDevice *device = [UIDevice currentDevice];					//Get the device object
	[device beginGeneratingDeviceOrientationNotifications];			//Tell it to start monitoring the accelerometer for orientation
	NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];	//Get the notification centre for the app
	[nc addObserver:self											//Add yourself as an observer
		   selector:@selector(orientationChanged:)
			   name:UIDeviceOrientationDidChangeNotification
			 object:device];

Function To Receive Notification Message

//********** ORIENTATION CHANGED **********
- (void)orientationChanged:(NSNotification *)note
{
	NSLog(@"Orientation  has changed: %d", [[note object] orientation]);
}

来源：http://www.ios-developer.net/iphone-ipad-programmer/development/notifications/orientation-change-notification