Screen orientation in ViewController that doesn't have a navigation controller

Question

I have an iOS 6 iPad app where most of ViewControllers have their Navigation Controller. In all these views I want the orientation to be only landscape, which works just fine. There is one View Controller though which does not have a Navigation Controller - I just open its view on top of Navigation Controller's top View Controller, but it's not a modal. I do want the user to be able to change screen's orientation on that View Controller, but keep landscape on all the rest of them. This is what I do:

Navigation Controller's subclass:

-(NSUInteger)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskLandscape;

}

-(BOOL)shouldAutorotate {
    return UIInterfaceOrientationIsLandscape(self.interfaceOrientation);
}

And here are the same methods for the particular View Controller that I want to have both landscape and portrait:

- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskAll;
}

- (BOOL)shouldAutorotate {
    return YES;
}

Since this View Controller doesn't have a Navigation Controller I was sure that this would solve the issue. However for some reason I'm still not able to flip the screen in this View Controller. Here is the way I show that View Controller - maybe this is the reason behind this:

UIWindow *window = [[UIApplication sharedApplication].windows objectAtIndex:0];
[[window.subviews objectAtIndex:0] addSubview:previewView];

Answer 1

In fact , the way you show this special view controller make your view unable to change orientation , because when device change orientation , it ask your key window's rootController whether it can orientate or not , and in your situation , you return landscape so your window only support landscape mode.

So maybe you should present it from your navigationController without animation . than implement - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation in your special view controller.

Further reading: Understand ViewController Orientation

Answer 2

- (NSUInteger)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskAll;
 }

Change this to

- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskLandscape;
}

If you have more doubts 

refer This How can I display one UIView in landscape?