Swift cloudkit CKFetchRecordZoneChangesOptions 无法返回删除记录答案

【问题标题】：Swift cloudkit CKFetchRecordZoneChangesOptions can't return delete recordSwift cloudkit CKFetchRecordZoneChangesOptions 无法返回删除记录
【发布时间】：2017-09-01 04:24:54
【问题描述】：

我不知道为什么我在CKFetchRecordZoneChangesOptions 上无法获取任何删除记录，我可以获取创建和修改的记录，但delete 就是无法删除记录。
昨天，我可以正常获取删除更改记录。

这是我的代码

public func handleNotification(whichNotification : Int) {

    zoneID = UserDataCustomZone.zoneID

    if #available(iOS 10.0, *) {

        // Use the ChangeToken to fetch only whatever changes have occurred since the last
        // time we asked, since intermediate push notifications might have been dropped.
        var changeToken: CKServerChangeToken? = nil
        let changeTokenData = UserDefaults.standard.data(forKey: serverChangeTokenKey)

        if changeTokenData != nil {
            changeToken = NSKeyedUnarchiver.unarchiveObject(with: changeTokenData!) as! CKServerChangeToken?
        }

        let options = CKFetchRecordZoneChangesOptions()
        options.previousServerChangeToken = changeToken
        let optionsMap = [zoneID!: options]
        let operation = CKFetchRecordZoneChangesOperation(recordZoneIDs: [zoneID!], optionsByRecordZoneID: optionsMap)
        operation.fetchAllChanges = true
        // only can receive created and modified change record
        operation.recordChangedBlock = { record in
           //show record
            print("check this out \(record)")

            }

    }

    operation.recordZoneChangeTokensUpdatedBlock = { zoneID, changeToken, data in

        print("print Token \(String(describing: changeToken))")

        guard let changeToken = changeToken else {
            return
        }

        let changeTokenData = NSKeyedArchiver.archivedData(withRootObject: changeToken)
        UserDefaults.standard.set(changeTokenData, forKey: self.serverChangeTokenKey)
    }

    operation.recordZoneFetchCompletionBlock = { zoneID, changeToken, data, more, error in
        guard error == nil else {
            return
        }
        guard let changeToken = changeToken else {
            return
        }

        let changeTokenData = NSKeyedArchiver.archivedData(withRootObject: changeToken)
        UserDefaults.standard.set(changeTokenData, forKey: self.serverChangeTokenKey)
    }

    operation.fetchRecordZoneChangesCompletionBlock = { error in
        guard error == nil else {
            return
        }
    }

    operation.qualityOfService = .utility

    let container = CKContainer.default()
    let db = container.privateCloudDatabase
    db.add(operation)

     } else {
        // Fallback on earlier versions
    }

}

【问题讨论】：

当我删除 Cloudkit 上的数据时，我可以获得订阅远程通知。

标签： swift icloud record cloudkit

【解决方案1】：

我注意到您已经定义了一个recordZoneChangeTokensUpdatedBlock 处理程序，它足以接收记录的创建和更新。但是，CKFetchRecordZoneChangesOperation 通过其recordWithIDWasDeletedBlock 处理程序通知记录删除。声明是：

var recordWithIDWasDeletedBlock: ((CKRecordID, String) -> Void)? { get set }

所以，基本上你需要包含以下额外的行：

operation.recordWithIDWasDeletedBlock = { recordID, recordType in ... }

在您的原始代码中。

参考Apple developer documentation。

整个过程和参考代码可以在CloudKit Quick Start指南的Fetching Changes章节Maintaining a Local Cache of CloudKit Records找到。

【讨论】：