The key that identifies the localized string to use for the alert message.
UIKit for Mac 13.0+Beta
When delivered to your app, the push notification gets the text for the alert by looking up the specified key in your app’s Localizable.strings file. When this property is set, the value in the init(fromRemoteNotificationDictionary:) property is ignored.
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.