Ios 搜索并返回cloudkit记录的单个字段

我有cloudKit格式的记录

KeyWords : String
Content : Asset

其中资产约为10万

我使用SearchDisplayController查询公共数据库，但它返回整个记录。我能找到的每一篇教程都是这样做的

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有没有办法只返回关键字字段，例如以某种方式使用谓词？

假设您使用CKQueryOperation获取记录，您可以将其属性设置为过滤掉不需要的值。像这样的

fetchOperation.desiredKeys = ["KeyWords"]

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假设您使用CKQueryOperation获取记录，您可以设置其属性以过滤掉不需要的值。像这样的

fetchOperation.desiredKeys = ["KeyWords"]

---

好的，我有办法了。这很可能是骇客，但我把它的信息为其他任何人在相同的情况下

let predicate = NSPredicate(value: true) // returns all - replace with whatever condition you want
let query = CKQuery(recordType: "Library", predicate: predicate) // create a query using the predicate
var operation = CKQueryOperation(query: query) // create an operation using the query
operation.desiredKeys = ["KeyWords"] // Array of whatever 'columns' you want to return
// operation.resultsLimit = 15 // optional limit on records

// Define a closure for what to do for each returned record
operation.recordFetchedBlock = { [weak self] (record:CKRecord!) in

    // Do whatever you want with each returned record  
    println(record.objectForKey("KeyWords"))

}

// Define a closure for when the operation is complete
operation.queryCompletionBlock = { [weak self] (cursor:CKQueryCursor!, error:NSError!) in

        if cursor != nil {
            // returns the point where the operation left off if you want t retrieve the rest of the records
        }

        dispatch_async(dispatch_get_main_queue(), { () -> Void in

            // Do what you want when process complete
            self!.tableView.reloadData()
            if error != nil {
                println("there was an error")
            }
        })
    }

self.publicDatabase!.addOperation(operation) // Perform the operation on given database

---

好的，我有办法了。这很可能是骇客，但我把它的信息为其他任何人在相同的情况下

let predicate = NSPredicate(value: true) // returns all - replace with whatever condition you want
let query = CKQuery(recordType: "Library", predicate: predicate) // create a query using the predicate
var operation = CKQueryOperation(query: query) // create an operation using the query
operation.desiredKeys = ["KeyWords"] // Array of whatever 'columns' you want to return
// operation.resultsLimit = 15 // optional limit on records

// Define a closure for what to do for each returned record
operation.recordFetchedBlock = { [weak self] (record:CKRecord!) in

    // Do whatever you want with each returned record  
    println(record.objectForKey("KeyWords"))

}

// Define a closure for when the operation is complete
operation.queryCompletionBlock = { [weak self] (cursor:CKQueryCursor!, error:NSError!) in

        if cursor != nil {
            // returns the point where the operation left off if you want t retrieve the rest of the records
        }

        dispatch_async(dispatch_get_main_queue(), { () -> Void in

            // Do what you want when process complete
            self!.tableView.reloadData()
            if error != nil {
                println("there was an error")
            }
        })
    }

self.publicDatabase!.addOperation(operation) // Perform the operation on given database

---

我使用的是

CKQuery

，我使用的是

publicDatabase？.performQuery

。是否有用于CKFetchRecordsOperation的并行方法。我发现这些文档相当迟钝@德里克：不，不幸的是没有。您必须重新编写代码才能使用具有此属性的CloudKit的NSOperation子类之一。谢谢您的帮助。我得到了一些工作，并张贴了代码作为答案。如果您不介意将目光投向它，我们将不胜感激。我使用的是

CKQuery

，我使用的是

publicDatabase？.performQuery

。是否有用于CKFetchRecordsOperation的并行方法。我发现这些文档相当迟钝@德里克：不，不幸的是没有。您必须重新编写代码才能使用具有此属性的CloudKit的NSOperation子类之一。谢谢您的帮助。我得到了一些工作，并张贴了代码作为答案。如果你不介意看一眼的话，我将不胜感激。