模态视图控制器无法在横向模式下启动

问题描述

我有一个基于导航的应用程序，它有一个详细视图（UIWebView），在UIToolbar的底部有操作按钮。我想在按下笔记按钮时添加笔记。当webview处于纵向模式时，一切正常。我按下备注按钮，模态视图打开正常并且效果很好。

I have a navigation based app that has a detail view (UIWebView) with action buttons across the bottom in a UIToolbar. I want to add 'notes' when the 'notes' button is pushed. Everything works fine when the webview is in portrait mode. I press the notes button, the modal view opens fine and works great.

当webview处于横向模式时会出现问题。如果我按下音符按钮，所有打开模态视图的代码都会被调用，但我得到的只是一个白色屏幕。一条评论：如果我以纵向打开模态视图然后旋转设备，它会精细旋转到横向模式。它只是在横向模式下无法正确打开。

The problem occurs when the webview is in landscape mode. If I press the notes button, all the code to open the modal view gets called but all I get is a white screen. One comment: If I open the modal view in portrait and then rotate the device, it rotates fine into landscape mode. It just won't open correctly in landscape mode.

我有另一个按钮，它会调出具有相同行为的邮件编辑器。这是我的UIWebViewController中的代码：

I have another button that brings up the mail composer which has the identical behavior. Here is the code in my UIWebViewController:

- (IBAction)addNotes:(id)sender
{
    NotesViewController *notesViewController;

    // create the view controller and set it as the root view of a new navigation
    // controller

    notesViewController = [[NotesViewController alloc] initWithPrimaryKey:self.record.primaryKey];
    UINavigationController *newNavigationController =
    [[UINavigationController alloc] initWithRootViewController:notesViewController];

    // present the navigation controller modally

    [self presentModalViewController:newNavigationController animated:YES];
    [notesViewController release];
    [self.view setNeedsDisplay]; // not sure if I need this!  I was trying different things...
    [self.devotionText setNeedsDisplay]; // ditto...
    [newNavigationController release];
}

有什么想法吗？我尝试过各种不同的东西都无济于事。我只是得到一个没有导航栏的白色屏幕（虽然顶部有一个状态栏）。

Any ideas? I've tried all sorts of different things to no avail. I just get a white screen with no navigation bar (although there is a status bar at the top).

推荐答案

模态不要总是得到有关旋转的信息，他们从状态栏中获取信息，这并不总是正常工作。把它放在你的viewWillAppear中修复： [UIApplication sharedApplication] .statusBarOrientation = self.interfaceOrientation 而且，如果你想在模态中使用导航控制器，你需要创建一个。

Modals don't always get information about rotations, and they get their info from the status bar, which doesn't always work right. Put this in your viewWillAppear to fix: [UIApplication sharedApplication].statusBarOrientation = self.interfaceOrientation And, if you want a navigation controller inside your modal, you need to create one.

此外，您不需要setNeedsDisplay。这只会影响当前的观看次数，而不会影响你所呈现的模式。

Also, you don't need the setNeedsDisplay. That only effects the current views, not the modal you are presenting.

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