iOS 5：您可以覆盖特定类中的UIAppearance自定义吗？ [英] iOS 5: Can you override UIAppearance customisations in specific classes?

问题描述

我正在构建一个包含许多视图控制器的应用程序：我有一个 UITabBarController ，它包含4 UINavigationController 。我希望所有导航栏都是我的自定义颜色，比如蓝色，我通过在我的应用委托中执行此操作来实现：

I'm building an app with many view controllers: I have a UITabBarController which holds 4 UINavigationController. I want all the nav bars to be my custom color, say blue, which I achieve by doing this in my app delegate:

[[UINavigationBar appearance] setTintColor:[UIColor blueColor]];

但是我还有一个特殊的视图控制器，它有一个地图，对于这个视图控制器，我想要使用 UIAppearance 覆盖蓝色导航栏设置，使其成为黑色不透明样式。我试过在 viewDidLoad 中调用它：

But I also have one special view controller which has a map, and for this view controller I want to override the blue navbar set using UIAppearance to make it the black opaque style. I've tried by calling this inside viewDidLoad:

self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
self.navigationController.navigationBar.translucent = YES;

但没有任何反应。可以这样做还是我必须放弃UIAppearance并为每个视图控制器手动设置 navigationBar 的属性？

But nothing happens. Can this be done or do I have to abandon UIAppearance and set the properties on navigationBar manually for each view controller?

推荐答案

你做这件事的方式应该有效，但事实并非如此。这确实有效：

The way you are doing it is supposed to work, but it doesn't. This does work though:

UINavigationBar.appearance(whenContainedInInstancesOf: [YourOtherVC.self]).tintColor = .black

Objective-C

Objective-C

[[UINavigationBar appearanceWhenContainedIn:[YourOtherVC class], nil] setTintColor:[UIColor blackColor]];

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