Xamarin.Forms Accessibility - Change the default element selected when screen changes.

Xamarin.Forms Accessibility-ChangeFocusedElement.cs

// Change default element selected when the screen changes.

// In the view controller...
public override void ViewDidAppear(bool animated)
{   
	base.ViewDidAppear (animated);

 	//pass in the object to get focus
 	UIAccessibility.PostNotification(UIAccessibilityPostNotification.ScreenChanged, myObject);
}

// In a constructor or callback, set the text spoken by voiceover when the element is selected...
myObject.AccessibilityLabel = “Say something useful.”;