[英]CloudKit Query Operation only returns 300 results
我目前正在设置CloudKit作为Parse的替代品,需要下载我的所有用户记录。 我目前有大约600条记录,但我只收到300条记录。
我正在使用名为“用户”的自定义记录区而不是默认的“用户”记录区域,因为此应用程序只会绑定到一个appID。
我使用的代码是基于以下问题的答案,但它不适合我。 当光标为nil时,似乎查询操作不会运行,因为从不调用print(userArray)。 在此先感谢您的帮助!
来自私有区域的CKQuery仅返回CloudKit中的前100个CKRecords
func queryAllUsers() {
let database = CKContainer.defaultContainer().privateCloudDatabase
let query = CKQuery(recordType: "User", predicate: NSPredicate(value: true))
let queryOperation = CKQueryOperation(query: query)
queryOperation.recordFetchedBlock = self.createUserObject
queryOperation.queryCompletionBlock = { cursor, error in
if cursor != nil {
print("there is more data to fetch")
let newOperation = CKQueryOperation(cursor: cursor!)
newOperation.recordFetchedBlock = self.createUserObject
newOperation.queryCompletionBlock = queryOperation.queryCompletionBlock
database.addOperation(newOperation)
} else {
print(userArray) //Never runs
}
}
database.addOperation(queryOperation)
}
func createUserObject(record: CKRecord) {
let name = record.objectForKey("Name") as! String!
let company = record.objectForKey("Company") as! String!
let dateInductionCompleted = record.objectForKey("DateInductionCompleted") as! NSDate!
var image = UIImage()
let imageAsset = record.objectForKey("Image") as! CKAsset!
if let url = imageAsset.fileURL as NSURL? {
let imageData = NSData(contentsOfURL:url)
let mainQueue = NSOperationQueue.mainQueue()
mainQueue.addOperationWithBlock() {
image = UIImage(data: imageData!)!
userArray.append(User(name: name, company: company, image: image, dateInductionCompleted: dateInductionCompleted))
}
}
print(userArray.count)
}
UPDATE
问题已得到解答,当使用游标进行大型查询时,这可能是一个固有的错误。 代码现在通过使用递归函数工作,下面的代码如下:
func queryRecords() {
let database = CKContainer.defaultContainer().privateCloudDatabase
let query = CKQuery(recordType: "User", predicate: NSPredicate(value: true))
let queryOperation = CKQueryOperation(query: query)
queryOperation.qualityOfService = .UserInitiated
queryOperation.recordFetchedBlock = populateUserArray
queryOperation.queryCompletionBlock = { cursor, error in
if cursor != nil {
print("There is more data to fetch")
self.fetchRecords(cursor!)
}
}
database.addOperation(queryOperation)
}
func fetchRecords(cursor: CKQueryCursor?) {
let database = CKContainer.defaultContainer().privateCloudDatabase
let queryOperation = CKQueryOperation(cursor: cursor!)
queryOperation.qualityOfService = .UserInitiated
queryOperation.recordFetchedBlock = populateUserArray
queryOperation.queryCompletionBlock = { cursor, error in
if cursor != nil {
print("More data to fetch")
self.fetchRecords(cursor!)
} else {
print(userArray)
}
}
database.addOperation(queryOperation)
}
func populateUserArray(record: CKRecord) {
let name = record.objectForKey("Name") as! String!
let company = record.objectForKey("Company") as! String!
let dateInductionCompleted = record.objectForKey("DateInductionCompleted") as! NSDate!
var image = UIImage()
let imageAsset = record.objectForKey("Image") as! CKAsset!
if let url = imageAsset.fileURL as NSURL? {
let imageData = NSData(contentsOfURL:url)
let mainQueue = NSOperationQueue.mainQueue()
mainQueue.addOperationWithBlock() {
image = UIImage(data: imageData!)!
userArray.append(User(name: name, company: company, image: image, dateInductionCompleted: dateInductionCompleted))
}
}
print(userArray.count)
}
你可以尝试设置:
queryOperation.qualityOfService = .UserInitiated
这表明您的用户交互需要数据。 否则可能会完全忽略de request。
如下所述,实际答案是您不应该重复使用完成块。 相反,您应该创建一个递归函数来从游标中获取下一个记录。 可以在以下位置找到样本: EVCloudKitDao
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