Fetching CloudKit User Record using UserRecordID

If I understood your question and you already have a CKRecordID. All you got to do then is to fetchRecordWithID using this CKRecordID you got.

let publicDatabase = CKContainer.defaultContainer().publicCloudDatabasepublicDatabase.fetchRecordWithID(recordId, completionHandler: { (fetchRecord: CKRecord?, fetchError: NSError?) in    if let error = fetchError    {        // error getting user record, try again        print("-> cloudKitFetchUserRecord - error fetching user record - Error \(error)")    }    else    {        if let record = fetchRecord        {            if record.recordType == CKRecordTypeUserRecord            {                // valid record                print("-> cloudKitFetchUserRecord - fetching user record - valid record found - \(record.recordID.recordName))")               // unwrap your values - on your case username               if let object = record.objectForKey("username") as? Bool                {                    // do something with object                }            }            else            {                // not valid record                print("-> cloudKitFetchUserRecord - fetching user record - The record that came back is not a CKRecordTypeUserRecord")            }        }        else        {            // record nil            print("-> cloudKitFetchUserRecord - fetching user record - fetch record returned nil")        }    }})