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;
}

NavigationController或TabBarController是需要提供样式的。以下是我的解决方法:https://stackoverflow.com/a/39072526/242769

Swift 3 iOS 10解决方案:

override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
 }

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。

iOS 7中的UIStatusBarStyle

iOS 7的状态栏是透明的，它后面的视图是透视的。

状态栏的样式是指其内容的外观。在ios7中，状态栏内容要么是暗的(UIStatusBarStyleDefault)，要么是亮的(UIStatusBarStyleLightContent)。uistatusbarstyleblack半透明和UIStatusBarStyleBlackOpaque在iOS 7.0中已弃用。使用UIStatusBarStyleLightContent代替。

如何改变UIStatusBarStyle

如果状态栏下面是一个导航栏，状态栏的样式将被调整以匹配导航栏的样式(UINavigationBar.barStyle):

具体来说，如果导航栏样式是UIBarStyleDefault，状态栏样式将是UIStatusBarStyleDefault;如果导航栏样式是UIBarStyleBlack，状态栏样式将是UIStatusBarStyleLightContent。

如果状态栏下面没有导航栏，状态栏样式可以在应用程序运行时由单个视图控制器控制和更改。

-[UIViewController preferredStatusBarStyle]是ios7新增的方法。它可以被重写以返回首选的状态栏样式:

- (UIStatusBarStyle)preferredStatusBarStyle
  {
      return UIStatusBarStyleLightContent;
  }

如果状态栏样式应该由子视图控制器控制，而不是由self控制，重写-[UIViewController childViewControllerForStatusBarStyle]以返回子视图控制器。

如果你想选择退出这个行为，并通过使用-[UIApplication statusBarStyle]方法设置状态栏样式，添加UIViewControllerBasedStatusBarAppearance键到应用程序的信息。plist文件并给它赋值NO。

注意，当使用self.navigationController.navigationBar.barStyle = UIBarStyleBlack;解决方案

请确保进入你的plist并设置“基于视图控制器的状态栏外观”为YES。如果不是，它将不起作用。