extern const NSNotificationName _Nonnull PTAnnotationManagerAnnotationsWillChangeNotification

Posted when annotations will be changed.

The notification object is the PTAnnotationManager instance that posted the notification. The userInfo dictionary of the NSNotification instance contains entries for at least one of the PTAddedAnnotationsUserInfoKey, PTModifiedAnnotationsUserInfoKey, PTRemovedAnnotationsUserInfoKey, or PTXFDFUserInfoKey keys, depending on if annotations will be added, modified, removed, or updated with an XFDF string, respectively.