Disallow orientation in a certain CCLayer only

Globally my game supports two orientations: landscape right and landscape left

In one subscreen (inheriting CCLayer) I need to lock the current orientation so that ... the current orientation is locked... When the user pops back to another screen (CCLayer), orientation should work freely again.

I did it like this:

Edit AppDelegate.h, add a mask for locking orientation:

@interface MyNavigationController : UINavigationController <CCDirectorDelegate>
@property UIInterfaceOrientationMask lockedToOrientation;
@end

In AppDelegate.m, synthesize the mask, and replace two functions:

@synthesize lockedToOrientation; // assign

-(NSUInteger)supportedInterfaceOrientations {
    if (!self.lockedToOrientation) {
        // iPhone only
        if( [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone )
            return UIInterfaceOrientationMaskLandscape;

        // iPad only
        return UIInterfaceOrientationMaskLandscape;
    }
    else {
        return self.lockedToOrientation;
    }
}

// Supported orientations. Customize it for your own needs
// Only valid on iOS 4 / 5. NOT VALID for iOS 6.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if (!self.lockedToOrientation) {
        // iPhone only
        if( [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone )
            return UIInterfaceOrientationIsLandscape(interfaceOrientation);

        // iPad only
        // iPhone only
        return UIInterfaceOrientationIsLandscape(interfaceOrientation);
    }
    else {
        // I don't need to change this at this point
        return NO;
    }
}

Then whenever I need to lock interface to a certain orientation, I access navController in the appdelegate. Check its interfaceOrientation property and set locked mask accordingly

AppController* appdelegate = (AppController*)[UIApplication sharedApplication].delegate;
const UIDeviceOrientation ORIENTATION = appdelegate.navController.interfaceOrientation;
appdelegate.navController.lockedToOrientation = ORIENTATION == UIInterfaceOrientationLandscapeLeft ? UIInterfaceOrientationMaskLandscapeLeft : UIInterfaceOrientationMaskLandscapeRight;

In dealloc or whenever I wanna remove the lock, I do this:

    AppController* appdelegate = (AppController*)[UIApplication sharedApplication].delegate;
    appdelegate.navController.lockedToOrientation = 0;