get Orientation of iPhone/iPad at runtime

Define previousOrientation first, as below in your class.h file

UIDeviceOrientation previousOrientation;

then write code in class.m as below to check the orientation of device. Remember Its not for accelerometer. 

- (id)init {

    

    if ((self=[super init])) {

        [[NSNotificationCenter defaultCenter] addObserver:self

                                                 selector:@selector(orientationChanged: )

                                                    name:@"UIDeviceOrientationDidChangeNotification" object:nil];

    }

}

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

    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

    

    previousOrientation = orientation;

    if (previousOrientation == UIDeviceOrientationPortrait)

    {
        NSLog(@"PORTRAIT");
    }

    else if (previousOrientation == UIDeviceOrientationLandscapeLeft)

    {
        NSLog(@"LANDSCAPE LEFT");
    }

    else if (previousOrientation == UIDeviceOrientationLandscapeRight)

    {
        NSLog(@"LANDSCAPE RIGHT");
    }
    else
    {
        NSLog(@"PORTRAIT DOWN");
    }
}