Swift 未调用CKQueryOperation上的recordFetchedBlock

我需要查询记录类型为“Event”的CKRecords。调用recordFetchedBlock时，我会将这些记录添加到数组中。但是，从未调用recordFetchedBlock。请帮忙！谢谢各位:

    //TODO: Query for all Event records
    var database: CKDatabase = CKContainer.defaultContainer().privateCloudDatabase

    let truePredicate = NSPredicate(value: true)
    let eventQuery = CKQuery(recordType: "Event", predicate: truePredicate)

    let queryOperation = CKQueryOperation(query: eventQuery)

    queryOperation.recordFetchedBlock = { (record : CKRecord!) in

            self.eventsArray.append(record)
            println("recordFetchedBlock: \(self.eventsArray)")
    }

    queryOperation.queryCompletionBlock = { (cursor : CKQueryCursor!, error : NSError!) in

        println("queryCompletionBlock: \(self.eventsArray)")
    }

    database.addOperation(queryOperation)

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所以我才意识到我的错误。我无意中调用了私有数据库上的查询（与公共数据库相反）。正在踢我自己