对于任何仍然与此斗争的人来说，这个简单的扩展在swift中应该为您解决这个问题。

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

在UINavigationController上，preferredStatusBarStyle不会被调用，因为它的topViewController优先于self。所以，要在UINavigationController上调用preferredStatusBarStyle，你需要改变它的childForStatusBarStyle (Swift) / childViewControllerForStatusBarStyle (ObjC)。

建议

重写你类中的UINavigationController:

class MyRootNavigationController: UINavigationController {
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    override var childForStatusBarStyle: UIViewController? {
        return nil
    }
}

非推荐替代方案

要为所有UINavigationController做这件事，你可以在一个扩展中覆盖(警告:它会影响UIDocumentPickerViewController, UIImagePickerController等)，但你可能不应该根据Swift文档这样做:

extension UINavigationController {
    open override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    open override var childForStatusBarStyle: UIViewController? {
        return nil
    }
}

在我的例子中，我意外地将视图/导航控制器呈现为UIModalPresentationStyle。overFullScreen，这导致preferredStatusBarStyle没有被调用。切换回UIModalPresentationStyle后。全屏，一切正常。

如果有人正在使用一个导航控制器，并希望他们所有的导航控制器都有黑色风格，你可以在Swift 3中写一个扩展到UINavigationController，它将应用于所有的导航控制器(而不是一次分配给一个控制器)。

extension UINavigationController {

    override open func viewDidLoad() {
        super.viewDidLoad()

        self.navigationBar.barStyle = UIBarStyle.black
    }

}

对于iOS 13.4, UINavigationController类别中的preferredStatusBarStyle方法将不会被调用，swizzling似乎是唯一的选择，不需要使用子类。

例子:

分类标题:

@interface UINavigationController (StatusBarStyle)
+ (void)setUseLightStatusBarStyle;
@end

实现:

#import "UINavigationController+StatusBarStyle.h"
#import <objc/runtime.h>

@implementation UINavigationController (StatusBarStyle)

void (^swizzle)(Class, SEL, SEL) = ^(Class c, SEL orig, SEL new){
    Method origMethod = class_getInstanceMethod(c, orig);
    Method newMethod = class_getInstanceMethod(c, new);
    if(class_addMethod(c, orig, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
        class_replaceMethod(c, new, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    else
        method_exchangeImplementations(origMethod, newMethod);
};

+ (void)setUseLightStatusBarStyle {
    swizzle(self.class, @selector(preferredStatusBarStyle), @selector(_light_preferredStatusBarStyle));
}

- (UIStatusBarStyle)_light_preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}    
@end

在AppDelegate.h中的用法:

#import "UINavigationController+StatusBarStyle.h"

[UINavigationController setUseLightStatusBarStyle];

Swift 4.2及以上版本

正如所选答案中提到的，根本原因是检查您的窗口根视图控制器对象。

流结构的可能情况

Custom UIViewController object is window root view controller Your window root view controller is a UIViewController object and it further adds or removes navigation controller or tabController based on your application flow. This kind of flow is usually used if your app has pre login flow on navigation stack without tabs and post login flow with tabs and possibly every tab further holds navigation controller. TabBarController object is window root view controller This is the flow where window root view controller is tabBarController possibly every tab further holds navigation controller. NavigationController object is window root view controller This is the flow where window root view controller is navigationController. I am not sure if there is any possibility to add tab bar controller or new navigation controller in an existing navigation controller. But if there is such case, we need to pass the status bar style control to the next container. So, I added the same check in UINavigationController extension to find childForStatusBarStyle

使用以下扩展，它处理所有上述场景-

extension UITabBarController {
    open override var childForStatusBarStyle: UIViewController? {
        return selectedViewController?.childForStatusBarStyle ?? selectedViewController
    }
}

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

extension AppRootViewController {
    open override var preferredStatusBarStyle: UIStatusBarStyle {
        return children.first { $0.childForStatusBarStyle != nil }?.childForStatusBarStyle?.preferredStatusBarStyle ?? .default
    }
}

在info中你不需要UIViewControllerBasedStatusBarAppearance键。Plist默认为true

对于更复杂的流程，需要考虑的要点

In case you present new flow modally, it detaches from the existing status bar style flow. So, suppose you are presenting a NewFlowUIViewController and then add new navigation or tabBar controller to NewFlowUIViewController, then add extension of NewFlowUIViewController as well to manage further view controller's status bar style. In case you set modalPresentationStyle other than fullScreen while presenting modally, you must set modalPresentationCapturesStatusBarAppearance to true so that presented view controller must receive status bar appearance control.