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我正在向导航控制器呈现这段代码（在呈现的视图控制器的基类中）：

-(void)presentInNavigationControllerWithViewController:(UIViewController*)viewController
{
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self];

nav.modalPresentationStyle = UIModalPresentationFormSheet;
nav.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
nav.view.autoresizingMask = UIViewAnimationTransitionNone;

[viewController presentModalViewController:nav animated:YES];


CGRect rect = self.finalRect; /*desired size +44 height*/
CGRect windowRect = [self.view.window convertRect:self.view.window.frame toView:self.view];
rect.origin.y = (windowRect.size.height-rect.size.height)/2;

nav.view.superview.frame = rect;
}

在用户单击文本视图后调整视图大小：

// in viewDidLoad:
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillAppear:)
                                             name:UIKeyboardWillShowNotification object:nil];

-(void)keyboardWillAppear:(NSNotification*)notification
{
UIView *view = self.navigationController.view.superview;

view.frame =  CGRectMake(view.frame.origin.x + 200,
                         view.frame.origin.y,
                         view.frame.size.width-200,
                         view.frame.size.height);
}

在横向模式下，结果view.frame.size.width-200是将视图的高度降低 200（我是因为视图的窗口处于纵向模式？）。另一个问题是阴影滞后于导航控制器。如果我将代码放在动画中 : [UIView animateWithDuration:0.25 animations:^{，而不是阴影，灰色矩形会落后。

这样做的正确方法是什么？（最好有动画）

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