Ios preferredStatusBarStyle不是'；我没打电话

我随后重写了

-preferredStatusBarStyle

，但没有调用它。 是否有任何选项可以更改以启用它？（我在项目中使用XIB。）

可能的根本原因 我也遇到了同样的问题，并且发现这是因为我没有在应用程序窗口中设置根视图控制器

我在其中实现了

preferredStatusBarStyle

的

UIViewController

用于

UIAbbarController

中，该控制器控制屏幕上视图的外观

当我将根视图控制器设置为指向此

UITabBarController

时，状态栏更改开始正常工作，正如预期的那样（并且调用了

preferredStatusBarStyle

方法）

替代方法（在iOS 9中已弃用） 或者，您可以在每个视图控制器中根据其背景颜色调用以下方法之一（视情况而定），而不必使用

setneedssStatusBarAppearanceUpdate

：

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

或

---

请注意，如果使用此方法，您还需要将plist文件中的

UIViewControllerBasedStatusBarAppearance

设置为

NO

。

Hippo回答的补充：如果您使用的是UINavigationController，则最好添加一个类别：

//  UINavigationController+StatusBarStyle.h:

@interface UINavigationController (StatusBarStyle)

@end



//  UINavigationController+StatusBarStyle.m:

@implementation UINavigationController (StatusBarStyle)

- (UIStatusBarStyle)preferredStatusBarStyle
{
    //also you may add any fancy condition-based code here
    return UIStatusBarStyleLightContent;
}

@end

---

该解决方案可能比切换到即将被弃用的行为要好。

对于任何使用UINavigationController的人：

extension UINavigationController {

    public override func childViewControllerForStatusBarHidden() -> UIViewController? {
        return self.topViewController
    }

    public override func childViewControllerForStatusBarStyle() -> UIViewController? {
        return self.topViewController
    }
}

@interface UINavigationController (StatusBarStyle)

@end

@implementation UINavigationController (StatusBarStyle)

-(UIViewController *)childViewControllerForStatusBarStyle {
    return self.topViewController;
}

-(UIViewController *)childViewControllerForStatusBarHidden {
    return self.topViewController;
}

@end

UINavigationController

在调用其子视图控制器时不会转发

preferredStatusBarStyle

。相反，它管理自己的状态——正如它应该做的那样，它在屏幕顶部绘制状态栏所在的位置，因此应该对其负责。因此，在导航控制器内的VCs中实现

preferredStatusBarStyle

将不会起任何作用-它们永远不会被调用

诀窍在于

UINavigationController

使用什么来决定为

UIStatusBarStyleDefault

或

UIStatusBarStyleLightContent

返回什么。它基于其

UINavigationBar.barStyle

。默认设置（

UIBarStyleDefault

）会导致出现黑暗的前景

UIStatusBarStyleDefault

状态栏。而

UIBarStyleBlack

将给出一个

UIStatusBarStyleLightContent

状态栏

TL；医生：

extension UINavigationController {

    public override func childViewControllerForStatusBarHidden() -> UIViewController? {
        return self.topViewController
    }

    public override func childViewControllerForStatusBarStyle() -> UIViewController? {
        return self.topViewController
    }
}

@interface UINavigationController (StatusBarStyle)

@end

@implementation UINavigationController (StatusBarStyle)

-(UIViewController *)childViewControllerForStatusBarStyle {
    return self.topViewController;
}

-(UIViewController *)childViewControllerForStatusBarHidden {
    return self.topViewController;
}

@end

如果要在

UINavigationController

上使用

UIStatusBarStyleLightContent

，请使用：

self.navigationController.navigationBar.barStyle = UIBarStyleBlack;

---

因此，我实际上向UINavigationController添加了一个类别，但使用了以下方法：

-(UIViewController *)childViewControllerForStatusBarStyle;
-(UIViewController *)childViewControllerForStatusBarHidden;

并让它们返回当前可见的UIViewController。使当前可见视图控制器可以设置其自己的首选样式/可见性

下面是完整的代码片段：

在Swift中：

extension UINavigationController {

    public override func childViewControllerForStatusBarHidden() -> UIViewController? {
        return self.topViewController
    }

    public override func childViewControllerForStatusBarStyle() -> UIViewController? {
        return self.topViewController
    }
}

@interface UINavigationController (StatusBarStyle)

@end

@implementation UINavigationController (StatusBarStyle)

-(UIViewController *)childViewControllerForStatusBarStyle {
    return self.topViewController;
}

-(UIViewController *)childViewControllerForStatusBarHidden {
    return self.topViewController;
}

@end

在Objective-C中：

extension UINavigationController {

    public override func childViewControllerForStatusBarHidden() -> UIViewController? {
        return self.topViewController
    }

    public override func childViewControllerForStatusBarStyle() -> UIViewController? {
        return self.topViewController
    }
}

@interface UINavigationController (StatusBarStyle)

@end

@implementation UINavigationController (StatusBarStyle)

-(UIViewController *)childViewControllerForStatusBarStyle {
    return self.topViewController;
}

-(UIViewController *)childViewControllerForStatusBarHidden {
    return self.topViewController;
}

@end

下面是如何在UIViewController中实现的：

presentedViewController.modalPresentationCapturesStatusBarAppearance = true

在Swift中

override public func preferredStatusBarStyle() -> UIStatusBarStyle {
    return .LightContent
}

override func prefersStatusBarHidden() -> Bool {
    return false
}

在Objective-C中

-(UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent; // your own style
}

- (BOOL)prefersStatusBarHidden {
    return NO; // your own visibility code
}

---

最后，确保您的应用程序plist没有将“基于视图控制器的状态栏外观”设置为否。请删除该行或将其设置为是（我认为这是iOS 7的默认设置？

以下是我解决此问题的方法

定义名为AGViewControllerAppearance的协议

AGViewControllerAppearance.h

#import <Foundation/Foundation.h>

@protocol AGViewControllerAppearance <NSObject>

@optional

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

@end

#import <UIKit/UIKit.h>

@interface UIViewController (Upgrade)

//
//  Replacements
//

- (void)upgradedViewWillAppear:(BOOL)animated;

@end

#导入
@协议AGViewControllerAppearance
@可选的
-（BOOL）showsStatusBar；
-（BOOL）animatessStatusBarVisibility；
-（UIStatusBarStyle）首选状态BarStyle；
-（UIStatusBarAnimation）首选状态Baranimation；
@结束

在UIViewController上定义一个名为升级的类别

UIViewController+Upgrade.h

#import <Foundation/Foundation.h>

@protocol AGViewControllerAppearance <NSObject>

@optional

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

@end

#import <UIKit/UIKit.h>

@interface UIViewController (Upgrade)

//
//  Replacements
//

- (void)upgradedViewWillAppear:(BOOL)animated;

@end

#导入
@界面UIViewController（升级）
//
//替代品
//
-（void）upgradedViewWillAppear：（BOOL）动画；
@结束

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

#导入“UIViewController+Upgrade.h”
#进口
#导入“AGViewControllerAppearance.h”//这是外观协议
@实现UIViewController（升级）
+（空）荷载
{
#pragma-clang诊断推送
#pragma-clang诊断被忽略“-Wselector”
方法viewWillAspect=class_getInstanceMethod（self，@selector（viewWillAspect:）；
#pragma-clang诊断流行语
方法upgradedViewWillAppear=class_getInstanceMethod（self，@selector（upgradedViewWillAppear:）；
方法交换实施（视图将显示，升级视图将显示）；
}
#pragma标记-实现
-（void）upgradedViewWillAppear:（BOOL）动画
{
//
//调用原始消息（可能有点困惑，我们正在
//调用“相同”方法，但实际上我们调用的是原始方法：））
//
[自升级视频：动画]；
//
//实施
//
if（[自确认协议：@协议（AGViewControllerAppearance）]）
{
UIViewController*ViewControllerConforming to Appearance=
（UIViewController*）自身；
//
//状态栏
//
if（[viewControllerConformingToAppearance respondsToSelector:@selector（preferredStatusBarStyle）]）
{
BOOL shouldAnimate=是；
if（[viewControllerConformingToAppearance respondsToSelector:@selector（AnimateStatusBarVisibility）]）
{
shouldAnimate=[ViewControllerConforming to Appearance AnimagesStatusBarVisibility]；
}
[[UIApplication sharedApplication]setStatusBarStyle:[ViewControllerConforming to Appearance preferredStatusBarStyle]
动画：应设置动画]；
}
if（[viewControllerConformingToAppearance respondsToSelector:@selector（showsStatusBar）]）
{
UIStatusBarAnimation动画=UIStatusBarAnimation幻灯片；
如果（[viewControllerConformingT
extension UINavigationController {
    open override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    open override var childViewControllerForStatusBarStyle: UIViewController? {
        return nil
    }
}

override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
 }

override open var childViewControllerForStatusBarStyle: UIViewController? {
  return topViewController
}

override open var childViewControllerForStatusBarHidden: UIViewController? {
  return topViewController
}

override var preferredStatusBarStyle: UIStatusBarStyle {
   return .lightContent
}

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

extension UINavigationController {

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

        self.navigationBar.barStyle = UIBarStyle.black
    }

}

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

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

    open override var childViewControllerForStatusBarHidden: UIViewController? {
        return self.topViewController
    }
}

extension UITabBarController {
    open override var childViewControllerForStatusBarStyle: UIViewController? {
        return self.childViewControllers.first
    }

    open override var childViewControllerForStatusBarHidden: UIViewController? {
        return self.childViewControllers.first
    }
}

extension UISplitViewController {
    open override var childViewControllerForStatusBarStyle: UIViewController? {
        return self.childViewControllers.first
    }

    open override var childViewControllerForStatusBarHidden: UIViewController? {
        return self.childViewControllers.first
    }
}

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

    open override var childForStatusBarHidden: UIViewController? {
        return self.topViewController
    }
}

extension UITabBarController {
    open override var childForStatusBarStyle: UIViewController? {
        return self.children.first
    }

    open override var childForStatusBarHidden: UIViewController? {
        return self.children.first
    }
}

extension UISplitViewController {
    open override var childForStatusBarStyle: UIViewController? {
        return self.children.first
    }

    open override var childForStatusBarHidden: UIViewController? {
        return self.children.first
    }
}

presentedViewController.modalPresentationCapturesStatusBarAppearance = true

override var childViewControllerForStatusBarStyle: UIViewController? {
  var childViewController = visibleViewController
  if let controller = childViewController, controller.isBeingDismissed {
    childViewController = topViewController
  }
  return childViewController?.childViewControllerForStatusBarStyle ?? childViewController
}

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
    }
}

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

#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

#import "UINavigationController+StatusBarStyle.h"

[UINavigationController setUseLightStatusBarStyle];