How to force a UIViewController to Portrait orientation in iOS 6

Question

As the ShouldAutorotateToInterfaceOrientation is deprecated in iOS 6 and I used that to force a particular view to portrait only, what is the c

Answer 1

I have a very good approach mixing https://stackoverflow.com/a/13982508/2516436 and https://stackoverflow.com/a/17578272/2516436

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{
    NSUInteger orientations = UIInterfaceOrientationMaskAllButUpsideDown;


    if(self.window.rootViewController){
        UIViewController *presentedViewController = [self topViewControllerWithRootViewController:self.window.rootViewController];
        orientations = [presentedViewController supportedInterfaceOrientations];
    }

    return orientations;
}

- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {
    if ([rootViewController isKindOfClass:[UITabBarController class]]) {
        UITabBarController* tabBarController = (UITabBarController*)rootViewController;
        return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
    } else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
        UINavigationController* navigationController = (UINavigationController*)rootViewController;
        return [self topViewControllerWithRootViewController:navigationController.visibleViewController];
    } else if (rootViewController.presentedViewController) {
        UIViewController* presentedViewController = rootViewController.presentedViewController;
        return [self topViewControllerWithRootViewController:presentedViewController];
    } else {
        return rootViewController;
    }
}

and return whatever orientations you want to support for each UIViewController

- (NSUInteger)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskPortrait;
}

Answer 2

Put this in the .m file of each ViewController you don't want to rotate:

- (NSUInteger)supportedInterfaceOrientations
{
    //return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft;
    return UIInterfaceOrientationMaskPortrait;
}

See here for more information.

Answer 3

This answer relates to the questions asked in the comments of the OP's post:

To force a view to appear in a given oriention put the following in viewWillAppear:

UIApplication* application = [UIApplication sharedApplication];
if (application.statusBarOrientation != UIInterfaceOrientationPortrait)
{
    UIViewController *c = [[UIViewController alloc]init];
    [self presentModalViewController:c animated:NO];
    [self dismissModalViewControllerAnimated:NO];
}

It's a bit of a hack, but this forces the UIViewController to be presented in portrait even if the previous controller was landscape

UPDATE for iOS7

The methods above are now deprecated, so for iOS 7 use the following:

UIApplication* application = [UIApplication sharedApplication];
if (application.statusBarOrientation != UIInterfaceOrientationPortrait)
{
     UIViewController *c = [[UIViewController alloc]init];
     [c.view setBackgroundColor:[UIColor redColor]];
     [self.navigationController presentViewController:c animated:NO completion:^{
            [self.navigationController dismissViewControllerAnimated:YES completion:^{
            }];
     }];
}

Interestingly, at the time of writing, either the present or dismiss must be animated. If neither are, then you will get a white screen. No idea why this makes it work, but it does! The visual effect is different depending on which is animated.

Answer 4

I have a relatively complex universal app using UISplitViewController and UISegmentedController, and have a few views that must be presented in Landscape using presentViewController. Using the methods suggested above, I was able to get iPhone ios 5 & 6 to work acceptably, but for some reason the iPad simply refused to present as Landscape. Finally, I found a simple solution (implemented after hours of reading and trial and error) that works for both devices and ios 5 & 6.

Step 1) On the controller, specify the required orientation (more or less as noted above)

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}

-(BOOL)shouldAutorotate
{
    return YES;
}

-(NSUInteger)supportedInterfaceOrientations
{
    NSInteger mask = UIInterfaceOrientationMaskLandscape;
    return mask;

}

Step 2) Create a simple UINavigationController subclass and implement the following methods

-(BOOL)shouldAutorotate {
        return YES;
}
- (NSUInteger)supportedInterfaceOrientations {
        return UIInterfaceOrientationMaskLandscape;
}

Step 3) Present your viewController

vc = [[MyViewController alloc]init];
MyLandscapeNavigationController *myNavigationController = [[MyLandscapeNavigationController alloc] initWithRootViewController:vc];
[self myNavigationController animated:YES completion:nil];

Hope this is helpful to someone.