iOS 6.0 Orientation

In iOS6,UINavigation Controller does not consult their children to determine whether they should autorotate.In another word iOS6 handle orientation by top-most controller.

The shouldAutorotateToInterfaceOrientation: method of UIViewController is deprecated. In its place, you should use the supportedInterfaceOrientations and shouldAutorotate methods.

iOS6 has three new method to handle orientation

// what we support
- (NSUInteger)supportedInterfaceOrientations 
{
    return UIInterfaceOrientationMaskAllButUpsideDown;
}

// should autorotate or not
- (BOOL) shouldAutorotate 
{
    return YES;
}

//initial orientation we want to have
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation 
{
    return UIInterfaceOrientationPortrait;
}

But where should we write those methods?


If you try to make the MasterViewController only has Portrait Orientation and the DetailViewController has Portrait Orientation and Landscape Orientation.

I find some tutorial,but It has a bug.
The bug is when your DetailViewController on Landscape Orientation press back button to MasterViewController will show Landscape Orientation.


Here's my solution.
You need to create a class that has a subclass of UINavigationController and set supportedInterfaceOrientations and shouldAutorotate in that class.

First,set this in your subclass of UINavigationController

- (NSUInteger)supportedInterfaceOrientations 
{ 
    return [[self topViewController] supportedInterfaceOrientations]; 
} 

- (BOOL)shouldAutorotate
{
    return YES;
}

set this on MasterViewController

- (NSUInteger)supportedInterfaceOrientations 
{ 
    return UIInterfaceOrientationMaskPortrait; 
} 

set this on DetailViewController

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAllButUpsideDown;
}

Another way - It doesn't need to subclass of UINavigationController
Add a Category to UINavigationController

@implementation UINavigationController (Rotation_IOS6)

-(BOOL)shouldAutorotate
{
    return [[self.viewControllers lastObject] shouldAutorotate];
}

-(NSUInteger)supportedInterfaceOrientations
{
    return [[self.viewControllers lastObject] supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}

@end

Another way - Compatible with the iOS4,5 code
Swap Method Implementations