A message that an undo manager sends after closing an undo group.
The undo manager posts this message after you call ``UndoManager/endUndoGrouping()``.
Because this is a "did"-style message, the undo manager sends the message after it closes the undo group.
Observe this message with the identifier ``NotificationCenter/MessageIdentifier/didCloseUndoGroup``, or specify its type directly to the `addObserver(of:for:using:)` method.
The ``NotificationCenter/MainActorMessage/Subject`` of this message type is ``UndoManager``.
This message interoperates with the notification ``NSNotification/Name/NSUndoManagerDidCloseUndoGroup``.
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 main actor message type for any observers.
To implement this method in your own `MainActorMessage` 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 `MainActorMessage` or `nil` if conversion is not possible.
Converts a posted main actor message into a notification for any observers.
To implement this method in your own `MainActorMessage` conformance, use the properties defined by the message to populate the ``Notification``'s ``Notification/userInfo``.
- Parameters:
- message: The posted `MainActorMessage`.
- Returns: The converted ``Notification``.
Creates a did close undo group message.
- Parameter groupIsDiscardable: A Boolean value that indicates whether the undo group as a whole is discardable.
get · iOS 26.0+
groupIsDiscardable
TypeScript
get groupIsDiscardable(): Promise<boolean>
Swift declaration
var groupIsDiscardable: Bool
A Boolean value that indicates whether the undo group as a whole is discardable.
