UIAppearance 的“当不包含在"中时 [英] UIAppearance's "when not contained in"

问题描述

我目前正在构建一个复杂的 UIAppearance 修饰符网络*，并且遇到了一个问题.

I am currently spinning a complex web of UIAppearance modifiers*, and have come across a problem.

我使用 FlatUIKit 的自定义 UIBarButton 外观协议导致 MFMailComposerViewController 抱怨并停止工作.

My usage of FlatUIKit's custom UIBarButton appearance protocol is causing MFMailComposerViewController to complain and stop working.

因此，不是使用 UIAppearance 的 whenContainedIn 方法来指定导致发生修改的类，而是有没有办法排除某些类，即when not包含在?

Therefore, instead of using UIAppearance's whenContainedIn method to specify classes that cause modification to occur, is there a way to exclude certain classes, i.e. a "when not contained in"?

*我说的是 UIAppearance 协议，该协议用于在应用的委托中预定义对象外观设置.

*I am talking about the UIAppearance protocol that is used to predefine object appearance settings in the app's delegate.

推荐答案

您可以使用 appearanceWhenContainedIn: 指定 nil 修改，这将给出默认外观:

You can use appearanceWhenContainedIn: to specify nil modification, which will give the default appearance:

[[UIBarButton appearance] setBarTintColor:[UIColor redColor]];
[[UIBarButton appearanceWhenContainedIn:[MFMailComposerViewController class], nil] setBarTintColor:nil];

从 iOS 9 SDK 开始，还有

As of iOS 9 SDK, there is also

[[UIBarButton appearance] setBarTintColor:[UIColor redColor]];
[[UIBarButton appearanceWhenContainedInInstancesOfClasses:@[[MFMailComposerViewController class]] setBarTintColor:nil];

可以像这样使用 Swift-2:

Which can be used Swift-2 like so:

UIBarButton.appearance().barTintColor = UIColor.redColor()
UIBarButton.appearanceWhenContainedInInstancesOfClasses([MFMailComposerViewController.self]).barTintColor = nil

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