iphone视图翻转:视图从上到下而不是从右到左翻转

我试着构建一个始终处于landsscape模式的应用程序。 我做了一些平常的事: plist添加了uiinterfaceorientation/uiinterfaceorientationlandscaperight 使用视图顶部的小箭头旋转界面生成器中的xibs。

my code for launching:
- (void)applicationDidFinishLaunching:(UIApplication *)application {    
        [[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];
    FlipViewController *flip = [[FlipViewController alloc] initWithNibName:@"FlipViewController" bundle:nil];
    [window addSubview:flip.view];
    [window makeKeyAndVisible];
}

但当我尝试执行“uiviewAnimationTransitionFromLeft”时,页面会从上到下而不是从右到左翻转。- -

这是我用来翻转视图的代码:

[UIView beginAnimations:@"View Flip" context:nil];
    [UIView setAnimationDuration:1.25];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

    UIViewController *coming = nil;
    UIViewController *going = nil;
    UIViewAnimationTransition transition;

    if (self.blueViewController.view.superview == nil) 
    {   
        coming = blueViewController;
        going = yellowViewController;
        transition = UIViewAnimationTransitionFlipFromLeft;
    }
    else
    {
        coming = yellowViewController;
        going = blueViewController;
        transition = UIViewAnimationTransitionFlipFromRight;
    }

    [UIView setAnimationTransition: transition forView:self.view cache:YES];
    [coming viewWillAppear:YES];
    [going viewWillDisappear:YES];
    [going.view removeFromSuperview];
    [self.view insertSubview: coming.view atIndex:0];
    [going viewDidDisappear:YES];
    [coming viewDidAppear:YES];

    [UIView commitAnimations];

“窗户”似乎忽略了一个事实,那就是它是在陆地上。六羟甲基三聚氰胺六甲醚。 有人能发现我的错误吗?