设备离线时CKQueryOperation不返回错误 [英] CKQueryOperation not returning error when device offline

问题描述

我想在我的CloudKit数据库上使用 CKQueryOperation ，而不是 performQuery 。

两者都有效，但是当使用CKQueryOperation时，我在设备离线时没有收到错误，但是当我使用 performQuery

以下是我的 performQuery 示例，数据库是我的 CKDatabase

  database.performQuery（q，inZoneWithID：nil）{（记录：[CKRecord] ?,错误：NSError？） in 
 if error！= nil {
 print（error！.localizedDescription）
 return 
} 
} 
  

当设备离线时给出错误，允许我提示用户。错误是

互联网连接似乎处于离线状态

但是，当我使用 CKQueryOperation

<$ p $时，我没有错误p> 设p = NSPredicate（格式：recordID IN％@，student.courses）
let q = CKQuery（recordType：String（Course），谓词：p）

let queryOperation = CKQueryOperation（query：q）

queryOperation.recordFetchedBlock = {记录在
//没有网络连接时调用 - 不输入范围
打印（记录）
}


queryOperation.queryCompletionBlock = {（游标：CKQueryCursor？，错误：NSError？）在
//没有网络连接时调用 - 不输入范围
打印（光标）
打印（错误）
}

database.addOperation（queryOperation）


通过连接，我收到两种方法的数据，因此它按预期工作。

我是怎么/在哪里使用 CKQueryOperation 时出错：

谢谢

解决方案

按照惯例，我发布一笔赏金，在接下来的一小时内找到答案或者2.不确定我是怎么错过的这个最初但它包含我正在寻找的答案。

所以通过添加这一行

  queryOperation.qualityOfService = .UserInitiated 
  

幕后的一些变化，我们有一些不错的行动

  queryOperation.queryCompletionBlock = { （游标：CKQueryCursor？，错误：NSError？）
 //我们收到错误信息......最后!! 
打印（错误）
} 
  

在Apple中找不到任何内容文档暗示这一点。

I am trying to use CKQueryOperation, rather then performQuery on my CloudKit database.

Both work, but when using a CKQueryOperation I am not getting an error when the device is offline, but I do when using performQuery

Here is the bare bones my performQuery example, database is my CKDatabase

database.performQuery(q, inZoneWithID: nil) { (records:[CKRecord]?, error:NSError?) in
    if error != nil {
        print(error!.localizedDescription)
        return
    }
}

An error is given when the device is offline, allowing me to prompt the user. The error is

The internet connection appears to be offline

However, I get no errors when I use a CKQueryOperation

let p = NSPredicate(format:"recordID IN %@", student.courses)
let q = CKQuery(recordType: String(Course), predicate: p)

let queryOperation = CKQueryOperation(query: q)

queryOperation.recordFetchedBlock = { record in
    // not called without network connection - doesn't enter scope
    print(record)
}


queryOperation.queryCompletionBlock = { (cursor: CKQueryCursor?, error: NSError?) in
    // not called without network connection - doesn't enter scope
    print(cursor)
    print(error)
}

database.addOperation(queryOperation)

With a connection I receive my data for both methods so it is working as expected.

How / Where am I informed of error when using CKQueryOperation ?

Thanks

解决方案

As per usual I post a bounty and find the answer within the next hour or 2. Not sure how I missed this originally but it contained the answer I was looking for.

So by adding this line

queryOperation.qualityOfService = .UserInitiated

something behind the scenes changes and we have some nice action within

queryOperation.queryCompletionBlock = { (cursor: CKQueryCursor?, error: NSError?) in
    // We get an error message... Finally !!
    print(error)
}

Couldn't find anything in the Apple Docs to hint at this either.

这篇关于设备离线时CKQueryOperation不返回错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！