I have UINavigationBar.
UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0.0f, 46.0f, 320.0f, 50.0f)];
navBar.tintColor = [UIColor blackColor];
[self.view addSubview:navBar];
And I want to remove standart top shadow. How can I do this?