从视图返回并更改方向

Question

使用SDK8.1我允许纵向方向，在.plist上左右横向。我有

1）导航控制器

@implementation OrientationRespectfulNavigationController

- (BOOL)shouldAutorotate
{
    BOOL retVal = [super shouldAutorotate];

    if (self.topViewController)
        retVal = [self.topViewController shouldAutorotate];

    return retVal;
}

- (NSUInteger)supportedInterfaceOrientations
{
    NSUInteger retVal = [super supportedInterfaceOrientations];

    if (self.topViewController)
        retVal = [self.topViewController supportedInterfaceOrientations];

    return retVal;
}

-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
     UIInterfaceOrientation retVal = [super preferredInterfaceOrientationForPresentation];

    if (self.topViewController)
        retVal = [self.topViewController preferredInterfaceOrientationForPresentation];

    return retVal;
}

2）UIViewController A

-(BOOL)shouldAutorotate
{
    return NO;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return  UIInterfaceOrientationMaskPortrait;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return  UIInterfaceOrientationPortrait;
}

2）UIViewController B

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape | UIInterfaceOrientationMaskPortrait;
}

所以，我以纵向启动应用程序。我看到ViewController A.然后我也以纵向推送到ViewController B.然后我旋转移动设备，B改变为风景。好。但是，为什么当我回到ViewController A出现在风景中？我怎么能永远用肖像强迫A？我证明了很多事情，我无法在stackoverflow中找到解决方案

由于