User Interface in iOS
iOS allows many visual attributes of the user interface controls to be themed using the UIAppearance APIs.
Apple groups related pieces of functionality into “frameworks” which equate to Xamarin.iOS namespaces.
UIKit is the
namespace that contains all the user interface controls for iOS.
There are two different mechanisms for controlling the layout when a view is resized or rotated: Autosizing and Autolayout.
This article covers the new types of haptic feedback available in iOS 10 and how to implement them in Xamarin.iOS.
Your code should only make changes to user interface controls from the main (or UI) thread. Any UI updates that occur on a different thread (such as a callback or background thread) may not get rendered to the screen, or could even cause a crash.