Given is the method to manage or change the orientation in iPad application

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
        return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown || interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
    }


    // orientation view swapping logic
    - (void)didRotate:(NSNotification *)notification {

    UIDeviceOrientation newOrientation = [[UIDevice currentDevice] orientation];
    if (newOrientation != UIDeviceOrientationUnknown || newOrientation != UIDeviceOrientationFaceUp || newOrientation != UIDeviceOrientationFaceDown) 
    {
           orientation = newOrientation;

    }

    // Write your orientation logic here
        if ((orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight)) 
    {
     // Clear the current view and insert the orientation specific view.
         [self clearCurrentView];
         [self.view insertSubview:yourLandscapeView atIndex:0];

    } else if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) 
    {
           // Clear the current view and insert the orientation specific view.
            [self clearCurrentView];
            [self.view insertSubview:yourPortraitView atIndex:0];

        }
    }

Given is the method to manage or change the orientation in iPad application

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
        return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown || interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
    }


    // orientation view swapping logic
    - (void)didRotate:(NSNotification *)notification {

    UIDeviceOrientation newOrientation = [[UIDevice currentDevice] orientation];
    if (newOrientation != UIDeviceOrientationUnknown || newOrientation != UIDeviceOrientationFaceUp || newOrientation != UIDeviceOrientationFaceDown) 
    {
           orientation = newOrientation;

    }

    // Write your orientation logic here
        if ((orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight)) 
    {
     // Clear the current view and insert the orientation specific view.
         [self clearCurrentView];
         [self.view insertSubview:yourLandscapeView atIndex:0];

    } else if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) 
    {
           // Clear the current view and insert the orientation specific view.
            [self clearCurrentView];
            [self.view insertSubview:yourPortraitView atIndex:0];

        }
    }