插入 UINavigationController 堆栈的 UIViewController 丢失 UIAppearance 设置答案

【问题标题】：UIViewController inserted into UINavigationController stack loses UIAppearance settings插入 UINavigationController 堆栈的 UIViewController 丢失 UIAppearance 设置
【发布时间】：2013-03-19 13:34:19
【问题描述】：

我为导航栏设置了 UIAppearance。

[[UINavigationBar appearance] setTitleTextAttributes: [self navigationBarTitleTextAttributes]];



-(NSDictionary *)navigationBarTitleTextAttributes
{
    // UINavigationBar title
    NSNumber *navBarTitleShadowOpacity = [self.personalityDictionary objectForKey:kNavBarTitleShadowOpacity];
    UIColor *navBarTitleColor = [UIColor colorWithHexString: [self.personalityDictionary objectForKey:kNavBarTitleColor] alpha:1.0f];
    UIColor *navBarTitleShadowColor = [UIColor colorWithHexString:[self.personalityDictionary objectForKey:kNavBarTitleShadowColor] alpha: [navBarTitleShadowOpacity floatValue]];

    return [NSDictionary dictionaryWithObjectsAndKeys:
     navBarTitleColor, UITextAttributeTextColor,
     navBarTitleShadowColor, UITextAttributeTextShadowColor,
     [NSValue valueWithUIOffset:UIOffsetMake(0, 1)], UITextAttributeTextShadowOffset,
     nil];
}

一切正常。在我的应用程序中，我需要在堆栈中插入一个视图控制器并弹出它。

ChatsViewController* chatsViewController = [[ChatsViewController alloc] init];

NSMutableArray *mutableViewControllers = [self.navigationController.viewControllers mutableCopy];

[mutableViewControllers insertObject: chatsViewController atIndex: [mutableViewControllers count] - 1];

[self.navigationController setViewControllers: mutableViewControllers animated: NO];

[self.navigationController popToViewController: chatsViewController animated: YES];

此时标题栏失去外观设置，恢复为默认白色。任何推入堆栈的新视图控制器也会失去其外观。

有什么问题？

【问题讨论】：

标签： objective-c uinavigationcontroller uiappearance

【解决方案1】：

如果你在 appDelegate 类中自定义这个，那么这个问题永远不会出现。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
  {
   // Code.........

   [[UINavigationBar appearance] setTitleTextAttributes: [self navigationBarTitleTextAttributes]]
  }

-(NSDictionary *)navigationBarTitleTextAttributes
 {

// NSNumber *navBarTitleShadowOpacity = [self.personalityDictionary objectForKey:kNavBarTitleShadowOpacity];
 UIColor *navBarTitleColor = [UIColor redColor];//: [self.personalityDictionary objectForKey:kNavBarTitleColor] alpha:1.0f];
 UIColor *navBarTitleShadowColor = [UIColor  greenColor];//colorWithHexString:[self.personalityDictionary objectForKey:kNavBarTitleShadowColor] alpha: [navBarTitleShadowOpacity floatValue]];

return [NSDictionary dictionaryWithObjectsAndKeys:
        navBarTitleColor, UITextAttributeTextColor,
        navBarTitleShadowColor, UITextAttributeTextShadowColor,
        [NSValue valueWithUIOffset:UIOffsetMake(0, 1)], UITextAttributeTextShadowOffset,
        nil];
  }

希望对你有帮助。

【讨论】：

这就是我正在做的事情 - 我的 AppearanceManager 类在我的导航控制器设置之前运行。