我正在处理这种情况,即用户以前已删除该应用程序,现在已重新安装它。
它碰到了我的增量获取功能,该功能正在接收许多旧的订阅通知,大部分是删除通知。但不下载当前记录。
我现在要添加代码以对每种记录类型执行提取以下载所有数据。
我想重置增量获取服务器令牌,因此该应用程序不必处理旧的订阅通知。但是我找不到如何做到这一点,也许这是不可能的。
答案 0 :(得分:0)
当您说“增量获取服务器令牌”时,您是指CKServerChangeToken
(documentation)吗?并且您是否正在尝试在CloudKit 私有数据库中进行同步?
假设是真的,这是我如何从私有数据库中获取更改并跟踪同步令牌的示例:
//MARK: Fetch Latest from CloudKit from private DB
func fetchPrivateCloudKitChanges(){
print("Fetching private changes...")
//:::
let privateZoneId = CKRecordZone.ID(zoneName: CloudKit.zoneName, ownerName: CKCurrentUserDefaultName)
/----
let options = CKFetchRecordZoneChangesOperation.ZoneOptions()
options.previousServerChangeToken = previousChangeToken
let operation = CKFetchRecordZoneChangesOperation(recordZoneIDs: [privateZoneId], optionsByRecordZoneID: [recordZoneID:options])
//Queue up the updated records to process below
var records = [CKRecord]()
operation.recordChangedBlock = { record in
records.append(record)
}
operation.recordWithIDWasDeletedBlock = { recordId, type in
//Process a deleted record in your local database...
}
operation.recordZoneChangeTokensUpdatedBlock = { (zoneId, token, data) in
// Save new zone change token to disk
previousChangeToken = token
}
operation.recordZoneFetchCompletionBlock = { zoneId, token, _, _, error in
if let error = error {
print(error)
}
// Write this new zone change token to disk
previousChangeToken = token
}
operation.fetchRecordZoneChangesCompletionBlock = { error in
if let error = error {
print(error
}else{
//Success! Process all downloaded records from `records` array above...
//records...
}
}
CloudKit.privateDB.add(operation)
}
//Change token property that gets saved and retrieved from UserDefaults
var previousChangeToken: CKServerChangeToken? {
get {
guard let tokenData = defaults.object(forKey: "previousChangeToken") as? Data else { return nil }
return NSKeyedUnarchiver.unarchiveObject(with: tokenData) as? CKServerChangeToken
}
set {
guard let newValue = newValue else {
defaults.removeObject(forKey: "previousChangeToken")
return
}
let data = NSKeyedArchiver.archivedData(withRootObject: newValue)
defaults.set(data, forKey: "previousChangeToken")
}
}
您的具体情况可能会有所不同,但是我认为这通常是要与CloudKit保持同步的方式。
更新
您可以尝试将previousServerChangeToken
存储在CloudKit的Users
记录中(您必须将其添加为新字段)。每次previousServerChangeToken
中的recordZoneFetchCompletionBlock
更改时,您都必须将其保存回用户记录中的iCloud中。