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]];