The style associated with the user interface.
Use this trait to determine whether your interface should be configured with a dark or light appearance. The default value of this trait is set to the corresponding appearance setting on the user's device.
The user interface style is available for trait environments with a
userInterfaceIdiom value of:
Retrieving Interface-Related Traits
The interface type for the device or an object that has a trait environment, such as a view and view controller.
Keys that indicate the availability of 3D Touch on a device. Only certain devices support 3D Touch. On those that do, the user can disable 3D Touch in the Accessibility area in Settings.
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