我正在寻找关于在Swift中处理CloudKit错误的一般建议，并且无法在线找到好的示例。这里是我想知道的事情：处理CloudKit错误
1）每次出现错误的可能性时，我是否应该考虑每一种错误类型，还是不是真的有必要？
2）我已经读过，处理CloudKit错误的一种常见方式是在错误消息提供的时间间隔后重试执行操作。这个重试基本上应该是我所有错误的标准程序吗？
3）不同的CloudKit操作（保存，获取等）会产生不同类型的错误，还是存在一组标准的CloudKit错误？
在此先感谢！我只是在寻找关于如何去解决CloudKit错误处理的一般信息，因为我不确定从哪里开始。
我已经写了一个CloudKit帮助，可以更容易地处理错误。这只是一个起点，还有很多可以做的事情。
此帮助程序在当前状态下的主要重点是可以轻松地重试在适当的超时后应该重试的错误。
但是，您仍然需要处理不应该重试的错误，例如用户的iCloud存储空间已满。即使使用这个帮助器，对这些帮助器方法之一的每次调用都需要正确处理结果，并可能向用户报告错误。当然，您可以添加一个帮助方法来检查所有可能的错误类型并显示相应的消息。然后，CloudKit代码的所有用途都可以调用该辅助方法。
这也只涉及一些可能的操作。您也想添加对其他操作的支持。最后，这还不能处理部分错误。这将是另一个有用的增强。
import Foundation
import CloudKit
public class CloudKitHelper {
private static func determineRetry(error: Error) -> Double? {
if let ckerror = error as? CKError {
switch ckerror {
case CKError.requestRateLimited, CKError.serviceUnavailable, CKError.zoneBusy, CKError.networkFailure:
let retry = ckerror.retryAfterSeconds ?? 3.0
return retry
default:
return nil
}
} else {
let nserror = error as NSError
if nserror.domain == NSCocoaErrorDomain {
if nserror.code == 4097 {
print("cloudd is dead")
return 6.0
}
}
print("Unexpected error: \(error)")
}
return nil
}
public static func modifyRecordZonesOperation(database: CKDatabase, recordZonesToSave: [CKRecordZone]?, recordZoneIDsToDelete: [CKRecordZoneID]?, modifyRecordZonesCompletionBlock: @escaping (([CKRecordZone]?, [CKRecordZoneID]?, Error?) -> Void)) {
let op = CKModifyRecordZonesOperation(recordZonesToSave: recordZonesToSave, recordZoneIDsToDelete: recordZoneIDsToDelete)
op.modifyRecordZonesCompletionBlock = { (savedRecordZones: [CKRecordZone]?, deletedRecordZoneIDs: [CKRecordZoneID]?, error: Error?) -> Void in
if let error = error {
if let delay = determineRetry(error: error) {
DispatchQueue.global().asyncAfter(deadline: .now() + delay) {
CloudKitHelper.modifyRecordZonesOperation(database: database, recordZonesToSave: recordZonesToSave, recordZoneIDsToDelete: recordZoneIDsToDelete, modifyRecordZonesCompletionBlock: modifyRecordZonesCompletionBlock)
}
} else {
modifyRecordZonesCompletionBlock(savedRecordZones, deletedRecordZoneIDs, error)
}
} else {
modifyRecordZonesCompletionBlock(savedRecordZones, deletedRecordZoneIDs, error)
}
}
database.add(op)
}
public static func modifyRecords(database: CKDatabase, records: [CKRecord], completion: @escaping (([CKRecord]?, Error?) -> Void)) {
CloudKitHelper.modifyAndDeleteRecords(database: database, records: records, recordIDs: nil) { (savedRecords, deletedRecords, error) in
completion(savedRecords, error)
}
}
public static func deleteRecords(database: CKDatabase, recordIDs: [CKRecordID], completion: @escaping (([CKRecordID]?, Error?) -> Void)) {
CloudKitHelper.modifyAndDeleteRecords(database: database, records: nil, recordIDs: recordIDs) { (savedRecords, deletedRecords, error) in
completion(deletedRecords, error)
}
}
public static func modifyAndDeleteRecords(database: CKDatabase, records: [CKRecord]?, recordIDs: [CKRecordID]?, completion: @escaping (([CKRecord]?, [CKRecordID]?, Error?) -> Void)) {
let op = CKModifyRecordsOperation(recordsToSave: records, recordIDsToDelete: recordIDs)
op.savePolicy = .allKeys
op.modifyRecordsCompletionBlock = { (savedRecords: [CKRecord]?, deletedRecordIDs: [CKRecordID]?, error: Error?) -> Void in
if let error = error {
if let delay = determineRetry(error: error) {
DispatchQueue.global().asyncAfter(deadline: .now() + delay) {
CloudKitHelper.modifyAndDeleteRecords(database: database, records: records, recordIDs: recordIDs, completion: completion)
}
} else {
completion(savedRecords, deletedRecordIDs, error)
}
} else {
completion(savedRecords, deletedRecordIDs, error)
}
}
database.add(op)
}
}
是的，你想检查每个cloudkit调用错误。 Apple在云端工具相关的WWDC视频中强调了这一点。
当您检测到错误时所做的工作差异很大。重试有时是一种选择，但有时不合适。如果您正在使用批处理操作，则重试可能需要一些额外的工作才能提取失败的记录。所以，是的，你可能有时想重试，但不是，你可能不会自动重试每一次失败的操作。
有一组错误，在CKError.h中定义。但是，你并不总是得到一个CKError。有时候，特别是CKErrorPartialFailure，您会得到一个顶级错误，其中包含您也必须展开的嵌套错误。由于IOS 10的，错误的CKError.h列表的样子：
typedef NS_ENUM(NSInteger, CKErrorCode) {
CKErrorInternalError = 1, /* CloudKit.framework encountered an error. This is a non-recoverable error. */
CKErrorPartialFailure = 2, /* Some items failed, but the operation succeeded overall. Check CKPartialErrorsByItemIDKey in the userInfo dictionary for more details. */
CKErrorNetworkUnavailable = 3, /* Network not available */
CKErrorNetworkFailure = 4, /* Network error (available but CFNetwork gave us an error) */
CKErrorBadContainer = 5, /* Un-provisioned or unauthorized container. Try provisioning the container before retrying the operation. */
CKErrorServiceUnavailable = 6, /* Service unavailable */
CKErrorRequestRateLimited = 7, /* Client is being rate limited */
CKErrorMissingEntitlement = 8, /* Missing entitlement */
CKErrorNotAuthenticated = 9, /* Not authenticated (writing without being logged in, no user record) */
CKErrorPermissionFailure = 10, /* Access failure (save, fetch, or shareAccept) */
CKErrorUnknownItem = 11, /* Record does not exist */
CKErrorInvalidArguments = 12, /* Bad client request (bad record graph, malformed predicate) */
CKErrorResultsTruncated NS_DEPRECATED(10_10, 10_12, 8_0, 10_0, "Will not be returned") = 13,
CKErrorServerRecordChanged = 14, /* The record was rejected because the version on the server was different */
CKErrorServerRejectedRequest = 15, /* The server rejected this request. This is a non-recoverable error */
CKErrorAssetFileNotFound = 16, /* Asset file was not found */
CKErrorAssetFileModified = 17, /* Asset file content was modified while being saved */
CKErrorIncompatibleVersion = 18, /* App version is less than the minimum allowed version */
CKErrorConstraintViolation = 19, /* The server rejected the request because there was a conflict with a unique field. */
CKErrorOperationCancelled = 20, /* A CKOperation was explicitly cancelled */
CKErrorChangeTokenExpired = 21, /* The previousServerChangeToken value is too old and the client must re-sync from scratch */
CKErrorBatchRequestFailed = 22, /* One of the items in this batch operation failed in a zone with atomic updates, so the entire batch was rejected. */
CKErrorZoneBusy = 23, /* The server is too busy to handle this zone operation. Try the operation again in a few seconds. */
CKErrorBadDatabase = 24, /* Operation could not be completed on the given database. Likely caused by attempting to modify zones in the public database. */
CKErrorQuotaExceeded = 25, /* Saving a record would exceed quota */
CKErrorZoneNotFound = 26, /* The specified zone does not exist on the server */
CKErrorLimitExceeded = 27, /* The request to the server was too large. Retry this request as a smaller batch. */
CKErrorUserDeletedZone = 28, /* The user deleted this zone through the settings UI. Your client should either remove its local data or prompt the user before attempting to re-upload any data to this zone. */
CKErrorTooManyParticipants NS_AVAILABLE(10_12, 10_0) = 29, /* A share cannot be saved because there are too many participants attached to the share */
CKErrorAlreadyShared NS_AVAILABLE(10_12, 10_0) = 30, /* A record/share cannot be saved, doing so would cause a hierarchy of records to exist in multiple shares */
CKErrorReferenceViolation NS_AVAILABLE(10_12, 10_0) = 31, /* The target of a record's parent or share reference was not found */
CKErrorManagedAccountRestricted NS_AVAILABLE(10_12, 10_0) = 32, /* Request was rejected due to a managed account restriction */
CKErrorParticipantMayNeedVerification NS_AVAILABLE(10_12, 10_0) = 33, /* Share Metadata cannot be determined, because the user is not a member of the share. There are invited participants on the share with email addresses or phone numbers not associated with any iCloud account. The user may be able to join the share if they can associate one of those email addresses or phone numbers with their iCloud account via the system Share Accept UI. Call UIApplication's openURL on this share URL to have the user attempt to verify their information. */
} NS_ENUM_AVAILABLE(10_10, 8_0);
一种方法，当你正在开发和测试应用程序，是检查每一个cloudkit操作错误，如果检测到火的NS停止应用程序。然后，检查错误，底层错误和上下文，以确定它失败的原因以及您需要对此做些什么。最有可能的是，随着时间的推移，你会看到常见的模式出现，然后你可以考虑构建一个通用的错误处理程序。