我的应用程序委托中有以下代码,仅允许在单个模态视图(GalleryPhotoViewer)上进行方向更改：

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

    if(self.window.rootViewController){
        UIViewController *presentedViewController = [[(UINavigationController *)self.window.rootViewController viewControllers] lastObject];

        //Support Portrait mode only on Photoviewer
        if ([[presentedViewController presentedViewController] isKindOfClass:GalleryPhotoViewController.class] ) {
            orientations = UIInterfaceOrientationMaskAll;
        }else{
            orientations = [presentedViewController supportedInterfaceOrientations];

        }
    }

    return orientations;
}

从父类(PhotosViewController)我打电话：

GalleryPhotoViewController *gpView = [GalleryPhotoViewController new];
[self presentViewController:gpView animated:YES completion:nil];

还有在我的父母(和其他意见)我有以下代码不允许肖像模式：

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

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if(interfaceOrientation == UIInterfaceOrientationPortrait) {
       return YES;
    } else {
        return NO;
    }
}

关于我如何保持我父母观点的方向的任何想法？我正在考虑可能只是以编程方式在viewWillAppear方法中改变方向,一旦模态被关闭,然后我不知道以前的方向是什么,更不用说我还没有找到代码来做这个不管ios6.

编辑/解决方案：所以我找到一个解决方案,我最后做的是离开应用程序：supportedInterfaceOrientationsForWindow：代码,只是将UINavigation子类添加到父视图,呈现模态视图,一切按预期工作,父级保留原来而模态能够自由地改变.

在我的父母：

//To make sure that this view remains in Landscape
@implementation UINavigationController (Rotation_IOS6)

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

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

@end

感谢@matt的建议.