47.2 The Widget Extension

A widget is created by adding a widget extension to an existing app. A widget extension consists of a Swift file, an optional intent definition file (required if the widget is to be user configurable), an asset catalog and an Info.plist file.

The widget itself is declared as a structure conforming to the Widget protocol, and it is within this declaration that the basic configuration of the widget is declared. The body of a typical widget declaration will include the following items:

•Widget kind – Identifies the widget within the project. This can be any String value that uniquely identifies the widget within the project.

•Widget Configuration – A declaration which conforms to the WidgetConfiguration protocol. This includes a reference to the provider of the timeline containing the information to be displayed, the widget display name and description, and the size families supported by the widget. WidgetKit supports two...