信号栏设置 白字 黑底

    // 信号栏 设置

    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

    [self setNeedsStatusBarAppearanceUpdate];

    self.view.backgroundColor = [UIColor blackColor];

    UIView *view = [[UIView alloc] initWithFrame:(CGRect){0,-20,kScreenWidth,20}];

    view.backgroundColor = [UIColor blackColor];

    [self.navigationController.navigationBar addSubview:view];