How to allow only single UIViewController to rotate in both Landscape and Portrait direction?

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Simple but it work very fine. IOS 7.1 and 8

AppDelegate.h

@property () BOOL restrictRotation;

AppDelegate.m

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
if(self.restrictRotation)
    return UIInterfaceOrientationMaskPortrait;
else
    return UIInterfaceOrientationMaskAll;
}

ViewController

-(void) restrictRotation:(BOOL) restriction
{
    AppDelegate* appDelegate = (AppDelegate*)[UIApplication sharedApplication].delegate;
    appDelegate.restrictRotation = restriction;
}

viewDidLoad

[self restrictRotation:YES]; or NO

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