If null, the UINavigationItem.Title will be shown.
This value can be null.
C# Example
var viewController = new SimpleViewController();
viewController.NavigationItem.TitleView = new UIView(){
Frame = new RectangleF(0, 0, 100, 30),
BackgroundColor = UIColor.Green
};
var navController = new UINavigationController(viewController);
window.RootViewController = navController;
F# Example
let viewController = new SimpleViewController()
viewController.NavigationItem.TitleView <- new UIView(BackgroundColor = UIColor.Green, Frame = new RectangleF(0.f, 0.f, 100.f, 30.f))
let navController = new UINavigationController(viewController)
window.RootViewController <- navController
