如何在导航栏的模态视图中更改iOS 7中的UIStatusBarStyle？ [英] How to change UIStatusBarStyle in iOS 7 in modal views with navigation bar?

问题描述

iOS 7 Transition Guide 提供了一个很好的提示如何在 UIViewController 中使用 UIStatusBarStyle p>

The iOS 7 Transition Guide give a good hint how to change the UIStatusBarStyle dynamically in a UIViewController using

- (UIStatusBarStyle)preferredStatusBarStyle {
     return UIStatusBarStyleDefault;
}

以及 [self setNeedsStatusBarAppearanceUpdate];

这在单个视图应用程序中工作正常。但是，我现在正在尝试将模态视图中的 UIStatusBarStyle 更改为 UIStatusBarStyleLightContent 。有一个 MainViewController ，它分隔到 ModalViewController ，它本身嵌入在 NavigationController 。 ModalViewController 已将其委托设置为 MainViewController 。

This works fine in a single view application. However, I'm now trying to change the UIStatusBarStyle in a modal view to UIStatusBarStyleLightContent. There is a MainViewController which segues to the ModalViewController, which itself is embedded in a NavigationController. The ModalViewController has set its delegate to the MainViewController.

我试图在 ModalViewController [self setNeedsStatusBarAppearanceUpdate]; $ c>以及该类中的以下方法没有效果：

I tried to call [self setNeedsStatusBarAppearanceUpdate]; in the ModalViewController together with the following method in that class without effect:

// In ModalViewController.m
- (UIStatusBarStyle)preferredStatusBarStyle {
     return UIStatusBarStyleLightContent;
}

我还试图调用 [self setNeedsStatusBarAppearanceUpdate]; MainViewController on prepareForSegue：sender：方法，条件为 - （UIStatusBarStyle）preferredStatusBarStyle {} 在呈现模态视图时返回 UIStatusBarStyleLightContent - 但也没有效果。

I also tried to call [self setNeedsStatusBarAppearanceUpdate]; in MainViewController on prepareForSegue: sender: method with conditions in - (UIStatusBarStyle)preferredStatusBarStyle {} to return UIStatusBarStyleLightContent when the modal view is presented - but that has no effects, too.

如何在模态视图中更改UIStatusBarStyle？

How can I change the UIStatusBarStyle in the modal view?

编辑：发布更新：我需要提到 ModalViewController 嵌入 NavigationController 并带有 NavigationBar 。将 NavigationBar 设置为隐藏到上面调用 [self setNeedsStatusBarAppearanceUpdate]; in ModalViewController 工作正常。但是当条形图可见时不是。

Post updated: I need to mention that the ModalViewController is embedded in a NavigationController with a NavigationBar. With NavigationBar set to hidden to above call of [self setNeedsStatusBarAppearanceUpdate]; in ModalViewController works fine. But not when the Bar is visible.

推荐答案

您需要一个在Fullscreen中显示的ViewController才能返回相应的状态栏信息。在你的情况下：包含ModalViewController的NavigationController需要实现 preferredStatusBarStyle 并返回 UIStatusBarStyleLightContent 。

You need a ViewController that's showing in Fullscreen to return the appropriate status bar infos. In your case: The NavigationController which contains ModalViewController needs to implement preferredStatusBarStyle and return UIStatusBarStyleLightContent.

只有在视图控制器返回的值实际发生更改时，才需要调用 setNeedsStatusBarAppearanceUpdate 。首次显示视图控制器时，无论如何都会查询它们。

A call to setNeedsStatusBarAppearanceUpdate is only necessary if the values a view controller returns actually change. When the view controller is first presented they are queried anyway.

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