MigrationStatus
A type the containing app uses to determine the status of a completed import.
Declaration
enum MigrationStatusOverview
After the first time the app launches, check this type’s static variable importStatus to determine whether a migration took place and, if so, whether it succeeded. To determine the status, check to see if importStatus is non-nil and that its value is MigrationStatus.success. After a successful migration, notify the person using the app that migration succeeded, and call the static method clearImportStatus().