UINavigationBar in a UIPopoverController looks ugly if created programatically - xamarin.ios

Question

I want to open a Popover in code after a specific action happens (e.g. tap on a button).
The following Code let me open a Popover with a NavigationBar but it don't looks like the one I've done with IB. (IB approach was embedding a UIViewController in a UINavigationController and defining the the two buttons cancel and save). The only thing I want is having these two buttons on top of the Popover. I don't use any navigation functionality!
var cell = grid.VisibleCellAtCoordinate(coordinate) as SDataGridTextCell;
var viewController = new UIViewController();
var navBar = new UINavigationBar(new RectangleF(0, 0, viewController.View.Bounds.Width, 50))
{
AutoresizingMask = UIViewAutoresizing.FlexibleWidth,
BarStyle = UIBarStyle.Black,
Translucent = true,
Items = new[]
{
new UINavigationItem("test")
{
LeftBarButtonItem = new UIBarButtonItem(UIBarButtonSystemItem.Cancel, (s, e) => { _popoverController.Dismiss(true); }),
RightBarButtonItem = new UIBarButtonItem(UIBarButtonSystemItem.Save, (s, e) => { _popoverController.Dismiss(true); })
}
}
};
var textField = new UITextField(new RectangleF(0, 50, viewController.View.Bounds.Width, viewController.View.Bounds.Height)) { Placeholder = "Mein Text...", BackgroundColor = UIColor.White };
textField.BecomeFirstResponder();
viewController.View.Add(navBar);
viewController.View.Add(textField);
viewController.View.SubviewAdded(textField);
_popoverController = new UIPopoverController(viewController);
_popoverController.SetPopoverContentSize(new SizeF(250, 200), false);
_popoverController.PresentFromRect(cell.Bounds, cell, UIPopoverArrowDirection.Any, false);
These buttons looks like this image (ugly):
And this image shows how it's look like when created in IB:

Answer 1

That's one of the caveats of using a standalone navigation bar in a popover. Embedding your view controller in a navigation controller is, as far as I know, the only way to avoid it.

Answer 2

Had some problem embedding the content view (UIViewController) correctly to the UINavigationController because I tried to add the navigation bar items (buttons) each time directly to the UINavigationController's NavigationItem property. But this must be done through the content view controller...
var contentViewController = new UIViewController();
var textField = new UITextField(contentViewController.View.Bounds)
{
BackgroundColor = UIColor.White,
AutoresizingMask = ~UIViewAutoresizing.None,
Placeholder = "My Text..."
};
contentViewController.View.Add(textField);
var navigationController = new UINavigationController(contentViewController);
contentViewController.Title = "Popover";
contentViewController.NavigationItem.LeftBarButtonItem = new UIBarButtonItem(UIBarButtonSystemItem.Cancel, (s, e) => { _popoverController.Dismiss(false); });
contentViewController.NavigationItem.RightBarButtonItem = new UIBarButtonItem(UIBarButtonSystemItem.Save, (s, e) => { _popoverController.Dismiss(false); });
_popoverController = new UIPopoverController(navigationController);
_popoverController.SetPopoverContentSize(new SizeF(300, 300), false);
_popoverController.PresentFromRect(button1.Bounds, button1, UIPopoverArrowDirection.Any, false);