Swift 是否在AppDelegate中设置状态栏？

以前，我有这个代码，它在Swift更新之前工作得很好。现在它说：

iOS 9.0中不推荐使用“statusBarStyle”的Setter:Use-[UIViewController preferredStatusBarStyle]

现在，我了解到您必须覆盖

statusBarStyle

，但我不想在每个

UIViewController

中手动执行此操作，而是通过

UIApplication

的

结构和
扩展来控制它。但我不知道该怎么做

代码：

extension UIApplication {
    var statusBarView: UIView? {
        return value(forKey: "statusBar") as? UIView
    }
}


struct StatusBar {

    static func setStatusBar() {
        let appDelegate = UIApplication.shared.delegate as? AppDelegate
        if let currentVC = appDelegate?.window?.rootViewController?.getCurrentlyDisplayedVC() {
            if currentVC is LoginVC || currentVC is SignUpVC || currentVC is SignUpVC {
                UIApplication.shared.statusBarView?.backgroundColor = .clear
            }
            else {
                UIApplication.shared.statusBarView?.backgroundColor = Colors.mainBlueColor
            }
        }
        UIApplication.shared.statusBarStyle = .lightContent
    }
}



extension UIViewController {

    func getCurrentlyDisplayedVC() -> UIViewController {

        if let presentedVC = presentedViewController {
            return presentedVC.getCurrentlyDisplayedVC()
        }
        else if let split = self as? UISplitViewController, let last = split.viewControllers.last {
            return last.getCurrentlyDisplayedVC()
        }
        else if let nav = self as? UINavigationController, let top = nav.topViewController {
            return top.getCurrentlyDisplayedVC()
        }
        else if let tab = self as? UITabBarController {

            if let selected = tab.selectedViewController {
                return selected.getCurrentlyDisplayedVC()
            }
        }
        return self
    }
}