UserNotifications watchOS 5.3 to 6.0 API Differences

UNNotificationCategory.h

Added UNNotificationCategoryOptionAllowAnnouncement

UNNotificationContent.h

Added UNNotificationContent.targetContentIdentifier

Added UNMutableNotificationContent.targetContentIdentifier

UNNotificationServiceExtension.h

Added UNNotificationServiceExtension

Added -[UNNotificationServiceExtension didReceiveNotificationRequest:withContentHandler:]

Added -[UNNotificationServiceExtension serviceExtensionTimeWillExpire]

UNNotificationSettings.h

Added UNNotificationSettings.announcementSetting

UNUserNotificationCenter.h

Added UNAuthorizationOptionAnnouncement