这是我解决这个问题的方法。

定义一个名为AGViewControllerAppearance的协议。

AGViewControllerAppearance.h

#import <Foundation/Foundation.h>

@protocol AGViewControllerAppearance <NSObject>

@optional

- (BOOL)showsStatusBar;
- (BOOL)animatesStatusBarVisibility;
- (UIStatusBarStyle)preferredStatusBarStyle;
- (UIStatusBarAnimation)prefferedStatusBarAnimation;

@end

在UIViewController上定义一个名为Upgrade的类别。

UIViewController+Upgrade.h

#import <UIKit/UIKit.h>

@interface UIViewController (Upgrade)

//
//  Replacements
//

- (void)upgradedViewWillAppear:(BOOL)animated;

@end

UIViewController+Upgrade.m

#import "UIViewController+Upgrade.h"

#import <objc/runtime.h>

#import "AGViewControllerAppearance.h" // This is the appearance protocol

@implementation UIViewController (Upgrade)

+ (void)load
{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wselector"
    Method viewWillAppear = class_getInstanceMethod(self, @selector(viewWillAppear:));
#pragma clang diagnostic pop
    Method upgradedViewWillAppear = class_getInstanceMethod(self, @selector(upgradedViewWillAppear:));
    method_exchangeImplementations(viewWillAppear, upgradedViewWillAppear);
}

#pragma mark - Implementation

- (void)upgradedViewWillAppear:(BOOL)animated
{
    //
    //  Call the original message (it may be a little confusing that we're
    //  calling the 'same' method, but we're actually calling the original one :) )
    //

    [self upgradedViewWillAppear:animated];

    //
    //  Implementation
    //

    if ([self conformsToProtocol:@protocol(AGViewControllerAppearance)])
    {
        UIViewController <AGViewControllerAppearance> *viewControllerConformingToAppearance =
        (UIViewController <AGViewControllerAppearance> *)self;

        //
        //  Status bar
        //

        if ([viewControllerConformingToAppearance respondsToSelector:@selector(preferredStatusBarStyle)])
        {
            BOOL shouldAnimate = YES;

            if ([viewControllerConformingToAppearance respondsToSelector:@selector(animatesStatusBarVisibility)])
            {
                shouldAnimate = [viewControllerConformingToAppearance animatesStatusBarVisibility];
            }

            [[UIApplication sharedApplication] setStatusBarStyle:[viewControllerConformingToAppearance preferredStatusBarStyle]
                                                        animated:shouldAnimate];
        }

        if ([viewControllerConformingToAppearance respondsToSelector:@selector(showsStatusBar)])
        {
            UIStatusBarAnimation animation = UIStatusBarAnimationSlide;

            if ([viewControllerConformingToAppearance respondsToSelector:@selector(prefferedStatusBarAnimation)])
            {
                animation = [viewControllerConformingToAppearance prefferedStatusBarAnimation];
            }

            [[UIApplication sharedApplication] setStatusBarHidden:(! [viewControllerConformingToAppearance showsStatusBar])
                                                    withAnimation:animation];
        }
    }
}

@end

现在，是时候说你的视图控制器正在实现AGViewControllerAppearance协议。

例子:

@interface XYSampleViewController () <AGViewControllerAppearance>

... the rest of the interface

@end

当然，你可以实现其余的方法(showsStatusBar, animatesStatusBarVisibility, prefereredstatusbaranimation)从协议和UIViewController+升级将做适当的 基于它们提供的值进行定制。

可能的根本原因

我也遇到了同样的问题，我发现这是因为我没有在我的应用程序窗口中设置根视图控制器。

我在UIViewController中实现了preferredStatusBarStyle，在UITabBarController中使用，它控制了屏幕上视图的外观。

当我设置根视图控制器指向这个UITabBarController时，状态栏的变化开始正确工作，正如预期的那样(preferredStatusBarStyle方法正在被调用)。

(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    ... // other view controller loading/setup code

    self.window.rootViewController = rootTabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}

替代方法(在iOS 9中已弃用)

另外，你也可以在每个视图控制器中调用以下方法之一，这取决于它的背景颜色，而不是必须使用setNeedsStatusBarAppearanceUpdate:

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

or

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];

注意，如果你使用这个方法，你还需要在plist文件中将UIViewControllerBasedStatusBarAppearance设置为NO。

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。

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 3 iOS 10解决方案:

override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
 }

Tyson的答案是正确的改变状态栏颜色为白色在UINavigationController。

如果有人想通过在AppDelegate中编写代码来实现相同的结果，那么请使用下面的代码并在AppDelegate的didFinishLaunchingWithOptions方法中编写它。

不要忘记在。plist文件中设置UIViewControllerBasedStatusBarAppearance为YES，否则更改将不会反映。

Code

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     // status bar appearance code
     [[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];

     return YES;
}