在iOS 6上处理iDevice旋转

Question

I'm having trouble figuring out how to handle device rotation on iOS 6. I have three things that need to change separately when the device is rotated.

• I have a parent UIViewController that handles multiple sub UIViewControllers or UINavigationControllers (Its basically a custom UITabBarController). I do not want this to rotate.
• Each of these sub view controllers, will either rotate or not rotate depending on its own settings. (I want some to rotate and some to not).
• In the tab bar, I want each tab icon (a UIView) to rotate to the orientation.

How would I go about making this happen in iOS 6, I got everything working in iOS 5.

Here is what I have so far:

In the parent UIViewController:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return UIInterfaceOrientationPortrait;
}

- (BOOL)shouldAutorotate
{
    return NO;
}

- (BOOL)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

In the sub view controllers:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
        return YES;
}

- (BOOL)shouldAutorotate
{
        return YES;
}

- (BOOL)supportedInterfaceOrientations
{
        return UIInterfaceOrientationMaskAll;
}

Answer 1

There's a bit more to this to support iOS6 correctly. The iOS 6 Release Notes sketch things out:

https://developer.apple.com/library/ios/#releasenotes/General/RN-iOSSDK-6_0/_index.html

This bit might be useful:

For compatibility, view controllers that still implement the shouldAutorotateToInterfaceOrientation: method do not get the new autorotation behaviors. (In other words, they do not fall back to using the app, app delegate, or Info.plist file to determine the supported orientations.) Instead, the shouldAutorotateToInterfaceOrientation: method is used to synthesize the information that would be returned by the supportedInterfaceOrientations method.

But you should also take a look at Session 236 from WWDC 2012 - The Evolution of View Controllers.

Answer 2

If you want to support different orientation in navigation stack, you must subclass UINavigationController first and override supportedInterfaceOrientations.

- (NSUInteger)supportedInterfaceOrientations
{
    //I want to support portrait in ABCView at iPhone only.
    //and support all orientation in other views and iPad.

    if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone)
    {
        // find specific view which you want to control.
        if ([[self.viewControllers lastObject] isKindOfClass:[ABCView class]])
        {
            return UIInterfaceOrientationMaskPortrait;
        }
    }

    //support all
    return UIInterfaceOrientationMaskAll;
}