这是我的代码片段：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [UIApplication sharedApplication].statusBarHidden = NO;

        self.window.clipsToBounds = YES;
        [[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleLightContent];
        self.window.frame =  CGRectMake(0,20,self.window.frame.size.width,self.window.frame.size.height-20);
        self.window.bounds = CGRectMake(0,self.window.frame.size.height);

        ...
        ...


}

当我写这个它显示状态栏与黑色背景我想要它与红色背景

：
如何用红色背景而不是黑色改变状态栏的颜色？