The localized subtitle, containing a secondary description of the reason for the alert.
Mac Catalyst 13.0+Beta
Use this property to specify additional context about the purpose of the notification. Subtitles offer additional context in cases where the title alone is not clear. Subtitles are not displayed in all cases. If your app is not authorized to display alert-based notifications, this property is ignored.
An array of attachments to display in an alert-based notification.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.