How to change nav text programmatically in iOS?

How Can I change the text of Nav Bar programmatically in iOS?
I can't use this.Title.

I could change some attributes using:

        UINavigationBar.Appearance.SetTitleTextAttributes(new UITextAttributes()
            {
                TextColor = UIColor.White,
                Font = UIFont.FromName("Font",30),
            });

But could not change the text.

Just to clarify, I can't use this.title because I'm using a carouselPage inside a TabPage and it seems to be generating some issues and this property is not working as expected.

anyone could help?