iOS 设置状态栏背景颜色

iOS 13后 禁止使用 KVC ，导致原来设置状态栏颜色的发失效，新方法在网上找了一圈发现都是一样的失效，后来发现 是要先添加 navgationController 后，在设置以下代码，实测iOS13下可以改变状态栏背景颜色

    ```       

        - (void)setStatusBarBackgroundColor:(UIColor *)color {

    if(@available(iOS13.0, *)) {

        staticUIView* statusBar =nil;

        if(!statusBar) {

  UIWindow*keyWindow = [UIApplicationsharedApplication].windows[0];

            statusBar = [[UIViewalloc]initWithFrame:keyWindow.windowScene.statusBarManager.statusBarFrame];

            [keyWindowaddSubview:statusBar];

            [statusBarsetBackgroundColor:color];

        }else{

          [statusBarsetBackgroundColor:color];

        }

    }else{

        UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];

        if([statusBarrespondsToSelector:@selector(setBackgroundColor:)]) {

          [statusBarsetBackgroundColor:color];

        }

    }

}

```

把这段代码卸载当前控制器里

```

- (void)viewDidLoad {

    [super viewDidLoad];

    [self.viewaddSubview:self.wkWebView];

    self setStatusBarBackgroundColor:[UIColor colorWithRed:47.0/255.0 green:131.0/255.0 blue:252.0/255.0 alpha:1.0]];

}

```

新建项目如果没有添加 UINavigationController直接设置是不起作用的

```

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

    MainViewController * viewC = [[MainViewController alloc]init];

    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

    UINavigationController * nav = [[UINavigationController alloc]initWithRootViewController:viewC];

    self.window.rootViewController = nav;

    [self.window makeKeyAndVisible];

    return YES;

}

```

最后不要忘记在plist文件里面设置View controller-based status bar appearance 为NO