What am I doing wrong in this really basic UIScrollView - ios

Question

I am trying to get this really basic UIScrollView to scroll horizontally and not vertically at all. I am following this example here on the Xamarin developer site: https://developer.xamarin.com/recipes/ios/content_controls/scroll_view/create_a_horizontal_scrolling_button_list/ But I cannot get the buttons to take up the entire scroll view and only scroll horizontally. I keep getting weird padding on the top and bottom of the list of buttons. Here is my entire class:
public partial class StackViewController : UIViewController
{
public StackViewController()
{
}
public override void DidReceiveMemoryWarning()
{
base.DidReceiveMemoryWarning();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
this.View.BackgroundColor = UIColor.White;
nfloat h = 50.0f;
nfloat w = 50.0f;
nint n = 25;
UIScrollView scrollView = new UIScrollView
{
Frame = new CGRect(0, 100, View.Frame.Width, 100),
ContentSize = new CGSize((w) * n, h),
BackgroundColor = UIColor.Green
};
for (int i = 0; i < n; i++)
{
var button = new UIButton();
button.SetTitle(i.ToString(), UIControlState.Normal);
button.Frame = new CGRect((i * w), 0, w, h);
button.BackgroundColor = UIColor.Blue;
scrollView.AddSubview(button);
}
View.AddSubview(scrollView);
}
}
Somehow I am missing some padding or layout property that I don't know about. I am semi-new to Xamarin ios development and I know that there is something simple that I am missing.

Answer 1

UIScrollviews can often add indicator insets as well as content insets. What I'd suggest doing is to override the 'ViewDidLayoutSubviews' method and put in the following code:
public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
scrollView.ContentInset = UIEdgeInsets.Zero;
scrollView.ScrollIndicatorInsets = UIEdgeInsets.Zero;
}