init(recordType:predicate:subscriptionID:options:)
Creates a named query-based subscription that queries records of a specific type.
Declaration
convenience init(recordType: CKRecord.RecordType, predicate: NSPredicate, subscriptionID: CKSubscription.ID, options querySubscriptionOptions: CKQuerySubscription.Options = [.firesOnRecordCreation, .firesOnRecordUpdate, .firesOnRecordDeletion])Parameters
- recordType:
The record’s type. You’re responsible for defining your app’s record types.
- predicate:
The predicate that identifies the records for inclusion in the subscription. For information about the operators that predicates support, see the discussion in Ckquery.
- subscriptionID:
The subscription’s name. You must specify a value that is unique in the target database, you should not specify an empty string.
- querySubscriptionOptions:
A bitmask of configuration options. See Options for more information.
Discussion
The subscription that this method returns is a query-based subscription with a scope that includes all of the user’s record zones. When CloudKit modifies a record that matches the specified type and predicate, it uses querySubscriptionOptions to determine whether to send a push notification.