我有代码从CloudKit的私有数据库中批量删除记录，但是它不起作用。 （我还注意到，保存的记录不会保留。）我使用的是带有我个人使用的真实Apple ID的实际iPhone 8，而不是开发者帐户。使用iPhone 8模拟器，我得到相同的结果。使用iPhone 8 Simulator以与开发人员帐户相同的Apple ID登录到iCloud时，我没有此问题。
在对这篇文章的回答没有给出解决方案之后，我认为关于此问题的最重要的事情是，当我使用不是我的开发者帐户的Apple ID时，就会发生此问题。我在不是我的开发人员帐户的两个不同的Apple ID上进行了尝试。这可能是我在某处俯瞰的环境吗？
在stackoverflow上没有类似的帖子可以解决此问题。
看起来应该删除该代码的某些记录实际上已删除，但没有删除。当我再次运行代码时，仍然存在记录，但是记录数比以前少了。
这是我的代码：
class AppDelegate: UIResponder, UIApplicationDelegate, UISplitViewControllerDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let splitViewController = window!.rootViewController as! UISplitViewController
let navigationController = splitViewController.viewControllers[splitViewController.viewControllers.count-1] as! UINavigationController
navigationController.topViewController!.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem
splitViewController.delegate = self
deleteRecords()
return true
}
}
let privateDatabase = CKContainer.default().privateCloudDatabase
func deleteRecords() {
print("deleteRecords()")
let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: DatabaseNameStrings.recordTypeAffirmation, predicate: predicate)
privateDatabase.perform(query, inZoneWith: nil) {
(records: [CKRecord]?, error: Error?) in
if error != nil {
print(error as Any)
} else {
if let records = records {
print("records.count=", records.count)
let recordIDsToDelete = records.map { $0.recordID }
print("recordIDsToDelete:")
print(recordIDsToDelete)
let operation = CKModifyRecordsOperation(recordsToSave: nil, recordIDsToDelete: recordIDsToDelete)
operation.modifyRecordsCompletionBlock = { savedRecords, deletedRecordIDs, error in
if error == nil {
print("Batch delete records!")
print("number of records deleted:", deletedRecordIDs?.count as Any)
printNumberOfRecords()
} else {
print(error as Any)
}
}
privateDatabase.add(operation)
}
}
}
}
func printNumberOfRecords() {
let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: DatabaseNameStrings.recordTypeAffirmation, predicate: predicate)
privateDatabase.perform(query, inZoneWith: nil) {
(records: [CKRecord]?, error: Error?) in
if error != nil {
print(error as Any)
} else {
if let records = records {
print("Number of records in CloudKit=", records.count)
}
}
}
}
这是代码的第一次运行在调试窗口中的输出：
deleteRecords()
records.count= 93
recordIDsToDelete:
[<CKRecordID: 0x280bbcb00; recordName=B33A3F23-23D3-44C6-AEBC-86DD718DBB62, zoneID=...>, ... ]
Batch delete records!
number of records deleted: Optional(93)
Number of records in CloudKit= 67
这是第二次运行代码时在调试窗口中的输出：
deleteRecords()
records.count= 92
recordIDsToDelete:
[<CKRecordID: 0x280080d00; recordName=BBA5B236-A036-4AC9-82E1-165D3B003E23, zoneID=...>, ... ]
Batch delete records!
number of records deleted: Optional(92)
Number of records in CloudKit= 52
当我使用此代码而不是deleteRecords（）时...
func deleteRecordsOneAtATime() {
print("deleteRecordsOneAtATime()")
let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: DatabaseNameStrings.recordTypeAffirmation, predicate: predicate)
privateDatabase.perform(query, inZoneWith: nil) {
(records: [CKRecord]?, error: Error?) in
if error != nil {
print(error as Any)
} else {
if let records = records {
print("records.count=", records.count)
let recordIDsToDelete = records.map { $0.recordID }
print("recordIDsToDelete:")
print(recordIDsToDelete)
for recordID in recordIDsToDelete {
privateDatabase.delete(withRecordID: recordID) {
(localRecordID: CKRecord.ID?, error: Error?) in
if error != nil {
print("error:\n", error as Any)
} else {
if localRecordID != nil {
print("localRecordID:", localRecordID as Any)
}
}
}
printNumberOfRecords()
}
}
}
}
}
我进入调试窗口：
deleteRecordsOneAtATime()
Number of records in CloudKit= 97
records.count= 97
recordIDsToDelete:
[<CKRecordID: 0x283622ec0; recordName=600B7BFE-04FE-4F63-BC4C-5AD1AE08908D, zoneID=...>, ... ]
localRecordID: Optional(<CKRecordID: 0x2821ff320; recordName=8E8CD0F0-FDF5-4CB9-B16C-5CF91C3503A2, zoneID=_defaultZone:__defaultOwner__>)
localRecordID: Optional(<CKRecordID: 0x2821ff320; recordName=8E0A0816-1B05-4707-A4E7-C40762E68663, zoneID=_defaultZone:__defaultOwner__>)
localRecordID: Optional(<CKRecordID: 0x28210b200; recordName=8E127624-F1D3-401E-ADF2-BB97354FCA98, zoneID=_defaultZone:__defaultOwner__>)
...
Number of records in CloudKit= 87
localRecordID: Optional(<CKRecordID: 0x282108660; recordName=962639D1-83E6-40D2-A57D-F70ADCEBED08, zoneID=_defaultZone:__defaultOwner__>)
localRecordID: Optional(<CKRecordID: 0x28210ff20; recordName=968D62AB-523E-464B-94B8-3C90E0382AB6, zoneID=_defaultZone:__defaultOwner__>)
localRecordID: Optional(<CKRecordID: 0x28210faa0; recordName=96C92DD2-ED27-4FED-8320-44D03981B04F, zoneID=_defaultZone:__defaultOwner__>)
localRecordID: Optional(<CKRecordID: 0x2821085a0; recordName=96A2D515-D3E7-475E-B609-8389DE4B88D1, zoneID=_defaultZone:__defaultOwner__>)
这是我最新的代码仍然不起作用：
func removeRecords() {
print("removeRecords()")
let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: DatabaseNameStrings.recordTypeAffirmation, predicate: predicate)
privateDatabase.perform(query, inZoneWith: nil) {
(records: [CKRecord]?, error: Error?) in
if error != nil {
print(error as Any)
} else {
if let records = records {
print("records.count=", records.count)
let recordIDsToDelete = records.map { $0.recordID }
print("recordIDsToDelete:")
print(recordIDsToDelete)
DispatchQueue.main.async {
if recordIDsToDelete.count > 50 {
let slice = Array(recordIDsToDelete[0 ..< 50])
let leftOver = Array(recordIDsToDelete[50 ... recordIDsToDelete.count-1])
privateDatabase.remove(recordsWith: slice) {
(result: Result<Void, Error>) in
print("result:", result)
switch result {
case .failure(let err):
print("failure")
print(err)
case .success(()):
print("success")
DispatchQueue.main.async {
privateDatabase.remove(recordsWith: leftOver) {
(result: Result<Void, Error>) in
print("result:", result)
switch result {
case .failure(let err):
print("failure")
print(err)
case .success(()):
print("success")
}
print("type of result:", type(of: result))
}
}
}
print("type of result:", type(of: result))
}
} else {
privateDatabase.remove(recordsWith: recordIDsToDelete) {
(result: Result<Void, Error>) in
print("result:", result)
switch result {
case .failure(let err):
print("failure")
print(err)
case .success(()):
print("success")
}
print("type of result:", type(of: result))
}
}
privateDatabase.remove(recordsWith: recordIDsToDelete) {
(result: Result<Void, Error>) in
print("result:", result)
switch result {
case .failure(let err):
print("failure")
print(err)
case .success(()):
print("success")
}
print("type of result:", type(of: result))
}
}
}
}
}
}
extension CKDatabase {
func remove(
recordsWith ids: [CKRecord.ID], completion: @escaping CompletionHandler<Void>) {
let operation = CKModifyRecordsOperation(recordIDsToDelete: ids)
operation.qualityOfService = .userInitiated
operation.modifyRecordsCompletionBlock = { _, _, error in
if let error = error {
print("error:")
print(error)
if let err = error as? CKError, let time = err.retryAfterSeconds {
DispatchQueue.main.asyncAfter(deadline: .now() + time) {
self.remove(recordsWith: ids, completion: completion)
}
} else {
completion(.failure(error))
print("CKDatabase.remove(_:_:) failed.")
}
} else {
completion(.success(()))
print("CKDatabase.remove(_:_:) succeeded.")
}
}
self.add(operation)
}
}
答案 0 :(得分：2)
有时CloudKit会向您抛出不同的错误，因此您必须确保处理它们，并在错误包含retryAfterSeconds时再次触发该调用。在这里，使用CKDatabase的包装方法可以非常轻松地处理中的错误。调用任何CloudKit API时，请确保将您的请求批量处理成较小的块（每个块100个项目）。
extension CKDatabase {
func remove(
recordsWith ids: [CKRecord.ID],
completion: @escaping (Result<Void, Error>) -> Void
) {
let operation = CKModifyRecordsOperation(recordIDsToDelete: ids)
operation.qualityOfService = .userInitiated
operation.modifyRecordsCompletionBlock = { _, _, error in
if let error = error {
if let err = error as? CKError, let time = err.retryAfterSeconds {
DispatchQueue.main.asyncAfter(deadline: .now() + time) {
self.remove(recordsWith: ids, completion: completion)
}
} else {
completion(.failure(error))
}
} else {
completion(.success(()))
}
}
self.add(operation)
}
}
答案 1 :(得分：1)
尝试这些更改；
之后
let operation = CKModifyRecordsOperation(recordsToSave: nil, recordIDsToDelete: recordIDsToDelete)
添加
operation.database = privateDatabase
operation.queuePriority = .veryHigh
operation.configuration = CKOperation.Configuration()
operation.configuration.qualityOfService = .userInteractive
然后开始操作；
operation.start()
代替；
privateDatabase.add(operation)
答案 2 :(得分：0)
我认为代码正在删除执行查询方法中的内容。只是perform查询方法没有从所有现有记录中返回记录ID。