iOS 6 – Force a rotation for a UIViewController inside a UINavigationController

Question

I have a UINavigationController where all UIViewController in the stack are portrait, except the last one, which is landscape. My current implementation shows the last view controller in portrait on push, but I can rotate to landscape, and the, cannot rotate back to portrait. How can I force the rotation to landscape when the view is pushed ?

My UINavigationController subclass :

@interface RotationViewController : UINavigationController

@end

@implementation RotationViewController

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    if (self.topViewController.class == [LoadingViewController class])
    {
        return UIInterfaceOrientationMaskLandscape;
    }

    return UIInterfaceOrientationMaskPortrait;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    if (self.topViewController.class == [LoadingViewController class])
    {
        return UIInterfaceOrientationLandscapeLeft;
    }

    return UIInterfaceOrientationPortrait;
}

@end

The view controller that I want landscape-only :

@implementation LoadingViewController

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationLandscapeLeft;
}

@end

Other view controllers don't implement any of these methods.

Answer 1

I have the same condition. So You can implement the below code in your application

- (void)viewDidAppear:(BOOL)animated
{ 
    [super viewDidAppear:animated];

    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:NO];
    CGAffineTransform landscapeTransform = CGAffineTransformMakeRotation(degreesToRadian(270));
    landscapeTransform = CGAffineTransformTranslate (landscapeTransform, 0.0, 0.0);
    [[self navigationController].view setTransform:landscapeTransform];
    self.navigationController.view.bounds = CGRectMake(0.0, 0.0, 480, 320);
    self.navigationController.navigationBar.frame = CGRectMake(0.0, 20.0, 480, 44.0); 
} 

-(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];   

    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait animated:NO];
    CGAffineTransform landscapeTransform = CGAffineTransformMakeRotation(degreesToRadian(0));
    landscapeTransform = CGAffineTransformTranslate (landscapeTransform, 0.0, 0.0);
    [[self navigationController].view setTransform:landscapeTransform];
    self.navigationController.view.bounds = CGRectMake(0.0, 0.0, 320, 480);
    self.navigationController.navigationBar.frame = CGRectMake(0.0, 20.0, 320.0, 44.0);
}

#define degreesToRadian(X) (M_PI * (X)/180.0)

Note:-

The above code is implement for the iphone. So Please change the bounds if you use this for ipad.

You need not to implement the

- (BOOL)shouldAutorotate

- (NSUInteger)supportedInterfaceOrientations

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation

functions in your view controller.... So remove those methods....

Answer 2

Check the question How to handle different orientations in iOS 6. See the answer there for a project example of exactly what you need.

Basically you need to embed a custom navigation controller in your viewcontroller (the one you want to rotate). Add the following method in this custom navigation controller

- (NSUInteger)supportedInterfaceOrientations
{
    return self.topViewController.supportedInterfaceOrientations;
}

and add to your view controller that should rotate:

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}

Be sure Portrait, Landscape Right and Landscape Left orientations are enabled in your project. Then, if you want to block some orientations for a particular view:

– application:supportedInterfaceOrientationsForWindow: