Here's how you implement autorotate conditionally when your view is in a UINavigationController

gistfile1.m

// This is inside a subclass of UINavigationController that has been set as the root view of the app.

- (BOOL)shouldAutorotate
{
    if ([self.topViewController isKindOfClass:[DetailViewController class]]) {
        return [self.topViewController shouldAutorotate];
    }
        
    return NO;
}

- (NSUInteger)supportedInterfaceOrientations
{
    if ([self.topViewController isKindOfClass:[DetailViewController class]]) {
        return [self.topViewController supportedInterfaceOrientations];
    }
    return UIInterfaceOrientationMaskPortrait;
}