ios statusbar背景透明能看到下层view的数据

- (void)viewDidLoad {
    [super viewDidLoad];
    //navbar背景
    UINavigationBar *navBar = [UINavigationBar appearance]; //删除
    [navBar setBackgroundColor:MCOLOR(COLOR_GLOBAL_B2)];    //删除
    //去除边框
    [self.navigationBar setBackgroundImage:[[UIImage alloc] init] // 删除 forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
    [self.navigationBar setShadowImage:[[UIImage alloc] init]];
    //title样式
    [self.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:20], NSFontAttributeName, MCOLOR(@"gray"), NSForegroundColorAttributeName, nil]];

    //添加这一行
    [self.navigationBar setBarTintColor:MCOLOR(COLOR_GLOBAL_B2)];
}