Grouping the notifications based on category or person by custom Notifications group
iOS 12.0+
Xcode 9 with Swift 4
The unique identifier for the thread or conversation related to this notification request. It will be used to visually group notifications together.
notificationContent.threadIdentifier = "Sparkout-HR"
The argument to be inserted in the summary for this notification.
notificationContent.summaryArgument = "your HR"
