The standard color objects you can use for labels, text, backgrounds, links, and more.
UIKit provides standard color objects for the foreground and background colors of your app's UI elements. The names of these color objects reflect their intended use, rather than specific color values.
Except where noted, standard color objects adapt automatically to Dark Mode changes when you use the provided
UIColor object. If you retrieve the color values, either directly or using another type such as
CGColor, you must handle Dark Mode changes yourself. For more information about supporting Dark Mode, see Supporting Dark Mode in Your Interface.