A message sent by a calendar when the system's calendar day changes, as determined by the system calendar, locale, and time zone.
If the device is asleep when the day changes, the calendar sends this message when the device wakes up.
If the device has been asleep for multiple days, the calendar sends only one message.
Observe this message with the identifier ``NotificationCenter/MessageIdentifier/calendarDayChanged``, or specify its type directly to the `addObserver(of:for:using:)` method.
The ``NotificationCenter/AsyncMessage/Subject`` of this message type is ``Calendar``.
This message interoperates with the notification ``NSNotification/Name/NSCalendarDayChanged``.
The system notifies observers of the message when the ``NotificationCenter`` posts the notification.
Similarly, the system notifies observers of the notification when it posts the message.
Converts a posted notification into this asynchronous message type for any observers.
To implement this method in your own `AsyncMessage` conformance, retrieve values from the ``Notification``'s ``Notification/userInfo`` and set them as properties on the message.
- Parameter notification: The posted ``Notification``.
- Returns: The converted `AsyncMessage`, or `nil` if conversion is not possible.
get · iOS 26.0+
name
TypeScript
static get nameValue(): NSNotification_Name
Swift declaration
static var name: Notification.Name { get }
A optional name corresponding to this type, used to interoperate with notification posters and observers.
