使用Swift对CloudKit进行CKReference

Question

我有一个RecordType Account和另一个Friends.因为Account我正在设置RecordID每个记录的创建,我有一个列Name.

对于朋友,我有两列,Me和MyFriend.MyFriend是包含RecordID帐户的参考.

如何检索作为我朋友的帐户名称？我需要查询Friends以获取Me我所在的所有记录,RecordID然后我需要使用这些记录的引用来从Account表中获取Names.

我尝试了以下但没有得到任何结果:

let predicate = NSPredicate(format: "Me = %@", recordID)
let query = CKQuery(recordType: "Friends", predicate: predicate)
publicDB.performQuery(query, inZoneWithID: nil) { (results, error) -> Void in
    if error != nil {
        println("Error fetching from Friends table: \(error.description)")
    } else {
        for friend in results {
            var key = friend.objectForKey("MyFriend") as String
            self.publicDB.fetchRecordWithID(CKRecordID(recordName: key), completionHandler: { (record, error) -> Void in
                if error != nil {
                    println(error.description)
                } else {
                    self.friends.append(record.objectForKey("Name") as String)
                }
            })
        }
        dispatch_semaphore_signal(self.semaphore)
    }
 }
 dispatch_semaphore_wait(self.semaphore, DISPATCH_TIME_FOREVER)`

Answer 1

如果MyFriend是CKReference,那么你不应该将它转换为字符串而是转换为CKReference,然后将其转换为recordID.recordName.所以代码看起来像这样:

var myFriend = friend.objectForKey("MyFriend") as CKReference
var key = myFriend.recordID.recordName