objective-c - 插入 UINavigationController 堆栈的 UIViewController 丢失 UIAppearance 设置

Question

我的导航栏有一个 UIAppearance 设置。

[[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。在我的应用程序中的某个时刻，我需要将一个 View Controller 插入堆栈并弹出到它。

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，恢复为默认的白色。任何插入堆栈的新 View Controller 也会丢失它们的外观。

有什么问题？

Answer 1

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

- (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。