iPhone - 关闭模态视图控制器后 - 页面顶部留下间隙 [英] IPhone - After dismissing Modal View Controller - gap is left at top of page

问题描述

启动应用程序时，如果用户没有存储登录信息，我想显示一个模态视图控制器来强制输入这些信息.我通过反复试验发现，这必须发生在我的根视图控制器的 viewDidAppear 中.我试图将它放在 viewDidLoad 和 viewWillAppear 中，但这些都不起作用，除非我将根视图控制器的视图分配给模式中使用的导航控制器的视图，然后导致其他问题...

When starting the app, if the user doesn't have login information stored, I want to display a modal view controller to force the entry of this information. I found through trial and error, that this had to occur in viewDidAppear of my root view controller. I tried to put it in viewDidLoad and viewWillAppear, but those didn't work unless I assigned the view of the root view controller to the view of the navigation controller used in the modal which then caused other issues...

所以我有:

- (void)viewDidAppear:(BOOL)animated
{
     NewAccountViewController *newAccountViewController = [[[NewAccountViewController alloc] initWithNibName:@"NewAccountViewController" bundle:nil] autorelease];

     UINavigationController *accountNavigationController = [[UINavigationController alloc] initWithRootViewController:newAccountViewController];
  [self presentModalViewController:accountNavigationController animated:YES];       
}

在 newAccountViewController 中，我有一个简单的导航项按钮，它使用dismissModalViewController 关闭模态视图控制器.

And in the newAccountViewController I have a simple navigation item button that dismisses the modal view controller with dismissModalViewController.

这一切都有效，当模态消失时，导航控制器中的视图可见，其导航项标题位于顶部......

This all works and when the modal is dismissed a view in a navigation controller is visible with its navigation item title at the top....

但是状态栏和蓝色导航项栏的顶部之间有一个和状态栏差不多大小的白色间隙.如果我不做模态，那么差距就永远不会存在.它只发生在模态出现和消失之后.我试过在present和dismissModalViewController上做animated:NO.我也试过不在模态中使用导航控制器，但也没有做任何事情.任何想法都会很棒！谢谢.

But there is a white gap about the same size as the status bar between the status bar and the top of the blue navigation item bar. If I don't do the modal, then the gap is never there. It only occurs after the modal is presented and dismissed. I've tried doing animated:NO on both the present and dismissModalViewController. I've also tried not using the navigation controller in the modal, and that did nothing as well. Any ideas would be great! Thanks.

推荐答案

事实证明这是因为我在当前视图控制器上调用了我的 modalviewcontroller，但是我的视图控制器已经有一个作为子视图加载的视图控制器.一旦我更改它以在子视图中创建视图控制器，加载模态，然后它就消失了.感谢您的帮助.

Turns out this was happening because I was calling my modalviewcontroller on the current view controller, but my view controller already had a another view controller loaded as a subview. Once I changed it to make the view controller in the subview, load the modal, then it went away. Thanks for all your help.

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