我在我的应用中使用 CloudKit,并开始遵循 WWDC 视频“CloudKit 最佳实践”中的最佳实践
要做的第一件事是检查我喜欢的更改,
let changesOperation = CKFetchDatabaseChangesOperation(previousServerChangeToken: databaseChangeToken)
changesOperation.fetchAllChanges = true
changesOperation.recordZoneWithIDChangedBlock = { self.recordZoneWithIDChanged($0) }
changesOperation.recordZoneWithIDWasDeletedBlock = { self.recordZoneWithIDWasDeleted($0) }
changesOperation.changeTokenUpdatedBlock = { self.changeTokenUpdate($0) }
changesOperation.fetchDatabaseChangesCompletionBlock = { self.fetchDatabaseChangesCompletion($0, isMoreComing: $1, error: $2) }
privateDatabase.add(changesOperation)
我正在为其设置提取的私有(private)数据库中的记录,但我只能获取 changeTokenUpdatedBlock
和 fetchDatabaseChangesCompletion
。
我是否正确地说,当我运行此操作时,我应该看到 recordZoneWithIDChangedBlock
被命中,并且我的私有(private)数据库的默认区域将传递到此 block ?
这意味着当我调用 fetchDatabaseChangesCompletion
时,没有任何内容可获取,因为记录区域 ID 数组为空:(注意,error
为零)
fileprivate func fetchDatabaseChangesCompletion(_ newToken: CKServerChangeToken?, isMoreComing: Bool, error: Error?)
{
if let error = error
{
// Handle error
return
}
let fetchZoneChangesOperation = CKFetchRecordZoneChangesOperation(recordZoneIDs: changedRecordZoneIDs,
optionsByRecordZoneID: nil)
fetchZoneChangesOperation.recordChangedBlock = { self.recordChanged($0) }
fetchZoneChangesOperation.recordWithIDWasDeletedBlock = { self.recordWithIDWasDeleted($0, string: $1) }
fetchZoneChangesOperation.recordZoneFetchCompletionBlock = { self.recordZoneFetchCompletion($0, newChangeToken: $1, clientSentChangeTokenData: $2, isMoreComing: $3, error: $4) }
fetchZoneChangesOperation.completionBlock = { self.fetchRecordZoneChangesCompletion() }
privateDatabase.add(fetchZoneChangesOperation)
}
最佳答案
我遇到了同样的问题,这是由于 CKFetchDatabaseChangesOperation
和 CKFetchRecordZoneChangesOperation
仅适用于自定义区域。 CloudKit 确实希望开发人员划分数据,以便他们在自定义区域中支持更多功能。
The disadvantage of using the default zone for storing records is that it does not have any special capabilities. You cannot save a group of records to iCloud atomically in the default zone. Similarly, you cannot use a CKFetchRecordChangesOperation object on records in the default zone.
CKRecordZone default()
Reference
CKFetchRecordChangesOperation
在 iOS 10 中已弃用,并替换为 CKFetchRecordZoneChangesOperation
。
关于cloudkit - CKFetchDatabaseChangesOperation 不返回记录区域 ID,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39655875/