iOS方向在特定屏幕上同时支持横向和纵向-并非所有屏幕

Question

Comrades,

I just would like to know, how to enable Landscape Orientation only on Specific screens? As of now, I selected Landscape Left and Right options in General Settings and enabled in Supported interface orientations (iPhone) in plist file for the device Orientation, but that impacts all the screens.

I have nearly 80 screens in my application, I need to support both Portrait and Landscape about 5 screens, rest of the screens should be shown only in Portrait mode.

Any help is greatly appreciated!

Thanks, Ramesh

Answer 1

In General Settings (which just adjusts your plist), you need to select all possible supported orientations. Then, you need to limit them in your specific view controller. If you're using a NavBar or TabBar controller, you need add your limitation there.

From the UIViewController docs:

In iOS 6 and later, your app supports the interface orientations defined in your app's Info.plist file. A view controller can override the supportedInterfaceOrientations method to limit the list of supported orientations. Typically, the system calls this method only on the root view controller of the window or a view controller presented to fill the entire screen; child view controllers use the portion of the window provided for them by their parent view controller and no longer participate directly in decisions about what rotations are supported. The intersection of the app's orientation mask and the view controller's orientation mask is used to determine which orientations a view controller can be rotated into.

To make this simpler, I created a category on UINavigationController that looks at the top-most view controller to determine it's rotation abilities. That way, in my specific view controllers that needed rotating, I could override those same methods and add landscape support.

@implementation UINavigationController (AutoRotation)

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

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

@end

Answer 2

Are your screens inside a UINavigationController ? If so, I've noticed not all viewControllers can decide what orientations they support.