CKFetchRecordChangesOperation不返回任何记录 [英] CKFetchRecordChangesOperation returns no records

问题描述

CKFetchRecordChangesOperation不返回任何记录。
我用nil来调用它，以最初获取所有记录，但它仅返回服务器令牌。
但是，如果我使用CKQuery可以正确获取所有记录。

CKFetchRecordChangesOperation in the simplified method below does not return any records. I call it with a nil, to initially get all the records, but it only returns the server token. However, if I use CKQuery I get all the records correctly.

我缺少什么？

 func fetchChangedRecords(token :CKServerChangeToken?) {

    println("\(__FUNCTION__) token: \(token)")

    let zoneID = CKRecordZoneID(zoneName: kMyZone, ownerName: CKOwnerDefaultName)
    var op = CKFetchRecordChangesOperation(recordZoneID: zoneID, previousServerChangeToken: token)

    op.recordChangedBlock = {
        record in
        println("\(__FUNCTION__) record \(record)")
    }

    op.recordWithIDWasDeletedBlock = {
        recordID in
        println("\(__FUNCTION__) record \(recordID)")

    }

    op.fetchRecordChangesCompletionBlock = {
        serverChangeToken, clientChangeToken, error in

        println("\(__FUNCTION__) server token  \(serverChangeToken), clientChangeToken \(clientChangeToken)")

        if let err = error {
            println("\(__FUNCTION__) Error: \(err)")
        }

         if op.moreComing {
            println("\(__FUNCTION__) moreComing")
            self.fetchChangedRecords(serverChangeToken)
        }
    }

    println("\(__FUNCTION__) op \(op)")

    privateDB.addOperation(op)
}

编辑：

因此，我根据moreComing的值使用附加的方法调用更新了代码。这是下面的内容。我还检查了该区域。

So, I updated the code with a an additional method call based on the value of moreComing. This below is what's printed. I also checked that the zone is there.

more似乎没有设置来。

moreComing does not seem to be set.

fetchChangedRecords token: nil 
fetchChangedRecords op <CKFetchRecordChangesOperation: 0x16dd3e30; operationID=14A302B7-2718-4E05-97C7-B28EC01ED75B> 
fetchChangedRecords server token  <CKServerChangeToken: 0x16ddfd80; data=AQAAAAAAAAACf/////////+p9bdUdAhLUK36bhza7+4g>, clientChangeToken nil 

zone fetching succeeded [<CKRecordZone: 0x16dda330; zoneID=MyZone:__defaultOwner__, capabilities=(Atomic,Sync)>, <CKRecordZone: 0x16d5bb70; zoneID=_defaultZone:__defaultOwner__, capabilities=(none)>]

推荐答案

不推荐使用 CKFetchRecordChangesOperation 。我认为它可能已由 CKFetchDatabaseChangesOperation 和 CKFetchRecordZoneChangesOperation 代替？ 2016年WWDC最佳讨论了 CKFetchDatabaseChangesOperation 做法，但这是在共享数据库的上下文中。

Looks like CKFetchRecordChangesOperation is deprecated. I think it may have been replaced by CKFetchDatabaseChangesOperation and CKFetchRecordZoneChangesOperation? CKFetchDatabaseChangesOperation is discussed in 2016 WWDC Best Practices, but it's in the context of shared databases.

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