Question

我需要将数据从12,000个项目的字典导出到Cloudkit。我尝试使用便捷API，但在尝试保存到公共数据库时，我一直在达到速率限制。我然后尝试了Operation API，我得到了类似的错误。我的问题是：如何在不超出限制的情况下将大量数据保存到cloudkit中？

Answer 1

根据CKErrorLimitExceeded错误代码的文档，您应该

尝试将您的请求重构为多个较小的批次。

因此，如果CKModifyRecordsOperation操作导致CKErrorLimitExceeded错误，您只需创建两个CKModifyRecordsOperation对象，每个对象都有一半来自失败操作的数据。如果你以递归方式执行此操作（因此任何拆分操作也可能因超出限制错误而失败，再次拆分为两个），那么最终应该获得一些CKModifyRecordsOperation个对象，这些对象具有足够少的记录以避免错误。

Answer 2

如果您有自己的服务器，可以尝试CloudKit Web Service API。

Answer 3

在iOS 10中，每次操作允许的最大记录数为400.

/// The system allowed maximum record modifications count.
///
/// If excute a CKModifyRecordsOperation with more than 400 record modifications, system will return a CKErrorLimitExceeded error.
private let maximumRecordModificationsLimit = 400

private func modifyRecords(recordsToSave: [CKRecord], recordIDsToDelete: [CKRecordID], previousRetryAfterSeconds: TimeInterval = 0, completion: ((Bool) -> Void)? = nil) {

    guard !recordsToSave.isEmpty || !recordIDsToDelete.isEmpty else {
        completion?(true)
        return
    }

    func handleLimitExceeded() {
        let recordsToSaveFirstSplit = recordsToSave[0 ..< recordsToSave.count / 2]
        let recordsToSaveSecondSplit = recordsToSave[recordsToSave.count / 2 ..< recordsToSave.count]
        let recordIDsToDeleteFirstSplit = recordIDsToDelete[0 ..< recordIDsToDelete.count / 2]
        let recordIDsToDeleteSecondSplit = recordIDsToDelete[recordIDsToDelete.count / 2 ..< recordIDsToDelete.count]

        self.modifyRecords(recordsToSave: Array(recordsToSaveFirstSplit), recordIDsToDelete: Array(recordIDsToDeleteFirstSplit))
        self.modifyRecords(recordsToSave: Array(recordsToSaveSecondSplit), recordIDsToDelete: Array(recordIDsToDeleteSecondSplit), completion: completion)
    }

    if recordsToSave.count + recordIDsToDelete.count > maximumRecordModificationsLimit {
        handleLimitExceeded()
        return
    }

    // run CKModifyRecordsOperation at here
}

将记录导出到cloudkit

3 个答案: