UINavigationBar外观和Facebook-Sheet Bug

问题描述

  UINavigationBar * navigationBar = [UINavigationBar外观]; 
 [navigationBar setBackgroundImage：[[UIImage imageNamed：@top_bar] stretchableImageWithLeftCapWidth：5 topCapHeight：5] forBarMetrics：UIBarMetricsDefault]; 
 [navigationBar setBackgroundImage：[[UIImage imageNamed：@top_bar_scape] stretchableImageWithLeftCapWidth：5 topCapHeight：5] forBarMetrics：UIBarMetricsLandscapePhone]; 
  

一切都很好，但我有一个奇怪的Bug，当我打开iOS6的Facebook共享表并打开观众列表（或专辑列表无关紧要）：导航栏使用我的top_bar-Image呈现。
请参阅以下屏幕：

< - 没有我的外观改变的正常

< - 随着我的外观变化越来越多

任何想法如何避免这个错误？
谢谢！ ：

解决方案

使用 UIAppearance 意味着它们在任何地方都会生效。这可能非常有用或非常讨厌。

您可以尝试解决此问题的一种方法是使用

  [[UINavigationBar appearanceWhenContainedIn ... ... 
  

，您可以制作导航栏的自定义子类，并将您的外观更改仅适用于：

  [[MYNavigationBar外观] setSomething：aThing]; 
  

I use the following code in my appdelegate:

UINavigationBar *navigationBar = [UINavigationBar appearance];
[navigationBar setBackgroundImage:[[UIImage imageNamed:@"top_bar"] stretchableImageWithLeftCapWidth:5 topCapHeight:5] forBarMetrics:UIBarMetricsDefault];
[navigationBar setBackgroundImage:[[UIImage imageNamed:@"top_bar_scape"] stretchableImageWithLeftCapWidth:5 topCapHeight:5] forBarMetrics:UIBarMetricsLandscapePhone];

Everything works fine but i got a weird Bug, when i open the iOS6 Facebook Sharing-Sheet and open the audience-list (or album list doesnt matter): The Navigationbar is rendered with my top_bar-Image.See screens below:

<- Normal without my appearance changes<- Buggy with my appearance changes

Any idea how avoid this bug?Thanks! :)

解决方案

Appearance changes made using the UIAppearance methods are global - meaning they take effect everywhere. This can be very very helpful or very very annoying.

One way you could try to fix this problem is either use

[[UINavigationBar appearanceWhenContainedIn:...

or, you could make a custom subclass of the navigation bar, and have your appearance changes applied only to it:

[[MYNavigationBar appearance] setSomething:aThing];

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