Disallow orientation in a certain CCLayer only - cocos2d-iphone

Question

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.

Answer 1

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;