ios - 无法使用 CloudKit 的 CKQueryOperation 从 iCloud 获取数据

Question

我实现了 CloudKit 抓取功能。但是我这里有一些问题。当我使用下面的代码时

    let cloudContainer = CKContainer.defaultContainer()
    let publicDatabase = cloudContainer.publicCloudDatabase
    let predicate = NSPredicate(value: true)
    let query = CKQuery(recordType: "Restaurant", predicate: predicate)

    publicDatabase.performQuery(query, inZoneWithID: nil, completionHandler: {
        results, error in
        if error == nil {
            print("Completed the download of Restauran data")
            self.restaurants = results! as [CKRecord]
            dispatch_async(dispatch_get_main_queue(), {
                self.tableView.reloadData()
            })
        } else {
            print(error)
        }
    })

我可以成功获取数据。但是，一旦我更改了代码，如

    restaurants = []
    let cloudContainer = CKContainer.defaultContainer()
    let publicDatabase = cloudContainer.publicCloudDatabase

    let predicate = NSPredicate(value: true)
    let query = CKQuery(recordType: "Restaurant", predicate: predicate)

    let queryOperation = CKQueryOperation(query: query)
    queryOperation.desiredKeys = ["name", "image"]
    queryOperation.queuePriority = .VeryHigh
    queryOperation.resultsLimit = 50

    queryOperation.recordFetchedBlock = { (record:CKRecord!) -> Void in
        if let restaurantRecord = record {
            self.restaurants.append(restaurantRecord)
        }
    }

    queryOperation.queryCompletionBlock = { [unowned self] (cursor, error) in
        if (error != nil) {
            print("Failed to get data from iCloud - \(error!.localizedDescription)")
        } else {
            print("Successfully retrieve the data form iCloud")
            dispatch_async(dispatch_get_main_queue(), {
                self.tableView.reloadData()
            })
        }
    }

    publicDatabase.addOperation(queryOperation)

使用 CKQueryOperation，我将无法获取数据。请问是哪里出了问题。

10.8 更新

我一直在尝试很多方法来解决这个问题。我发现应用程序甚至没有输入 recordFetchedBlock 和 queryCompletionBlock。我不知道为什么会这样。

Answer 1

最后，今天我修复了您请求的代码的错误。它现在正在工作...请问我是否需要进一步的帮助。谢谢。

restaurants = []
let cloudContainer = CKContainer.defaultContainer()
let publicDatabase = cloudContainer.publicCloudDatabase

let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: "Restaurant", predicate: predicate)

let queryOperation = CKQueryOperation(query: query)
queryOperation.desiredKeys = ["name", "image"]
queryOperation.queuePriority = .VeryHigh
queryOperation.resultsLimit = 50

queryOperation.recordFetchedBlock = { (record:CKRecord!) -> Void in

    self.restaurants.append(record)
}

queryOperation.queryCompletionBlock = { (cursor: CKQueryCursor?, error: NSError?) in
  dispatch_async(dispatch_get_main_queue()) {
    if (error != nil) {
        print("Failed to get data from iCloud - \(error!.localizedDescription)")
    } else {
        print("Successfully retrieve the data form iCloud")
        self.tableView.reloadData()

    }
  }
}