identifier
A unique reverse DNS notation string, such as com.example.MyApp.updatecheck, that identifies the activity.
Declaration
var identifier: String { get }Discussion
This string should remain constant for an activity across launches of your app because the system uses this unique identifier to track the number of times the activity has run and to improve the heuristics for deciding when to run it again in the future. nil and zero-length strings are not allowed. See Configure Scheduler Properties.