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NCWidgetProviding
protocol. When your widget receives the widgetPerformUpdateWithCompletionHandler:
call, update your widget’s view with the most recent content and call the completion handler, using one of the following constants to describe the result of the update: NCUpdateResultNewData
—The new content required you to redraw the view NCUpdateResultNoData
—The widget doesn’t require updating NCUpdateResultFailed
—An error occurred during the update process”