Preferred status bar style of view controller is ignored when in navigation controller

问题

I'm writing an iOS App with multiple views. I've set the App to use ViewController-based status bar style, which allows me to use the following code

override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
} 

That worked like expected.

But then I've embedded the views in a navigation controller and connected a BarButtonItem with a showSegue. Since then the ViewController of the view switched to ignores the style settings and shows the default black status bar.

回答1:

When you're in a navigation controller that will not get called. The navigation controller's preferredStatusBarStyle will be called. Try this along with your code:

extension UINavigationController {

   open override var preferredStatusBarStyle: UIStatusBarStyle {
      return topViewController?.preferredStatusBarStyle ?? .default
   }
}

回答2:

There is a solution that is a bit more concise (and recommended by Apple):

extension UINavigationController {
    override open var childForStatusBarStyle: UIViewController? {
        return topViewController
    }
}

来源：https://stackoverflow.com/questions/41026514/preferred-status-bar-style-of-view-controller-is-ignored-when-in-navigation-cont