搜索 return 个 cloudkit 记录字段

Question

我有 cloudKit 条格式为

的记录

KeyWords : String
Content : Asset

资产约10万。

我正在使用 SearchDisplayController 查询 public 数据库，但它 return 正在查询整个记录。我能找到的每个教程也是这样做的。

有没有办法只 return KeyWords 字段，例如以某种方式使用谓词？

Answer 1

假设您正在使用 CKQueryOperation 获取记录，您可以设置其 desiredKeys 属性以过滤掉不需要的值。像这样。

fetchOperation.desiredKeys = ["KeyWords"]

Answer 2

好的，有一些工作。这可能很老套，但我把它贴出来供处于相同情况的其他人参考...

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

搜索 return 个 cloudkit 记录字段

Search and return single field of cloudkit records

ios

swift

cloudkit