ios - Core Data 第一次没有在实体中保存数据

Question

我正在开发一个使用 ios 核心数据的应用程序。并且有很多实体和大量数据要保存，所以这就是为什么我使用“私有(private)上下文”方法和使用 block 将数据保存在后台线程中。所有实体都很好，除了一个。

在这个实体中，当应用程序启动并同步数据时，数据不会在第一次保存，但之后，如果我再次同步数据，该实体中的所有数据都会被保存。这是我保存数据的代码:

let programAttendeeAssignArray:NSArray? = dict["data_assign"] as AnyObject? as? NSArray
for var paAssignIndex = 0; paAssignIndex < programAttendeeAssignArray?.count; paAssignIndex++ {
    let programAttendeeAssignObj:NSDictionary? = programAttendeeAssignArray?.objectAtIndex(paAssignIndex) as AnyObject? as? NSDictionary
    if let paAssignDict = programAttendeeAssignObj as? [String: AnyObject] {
        var keyString: String = ""
        if let eID = paAssignDict["id"]! as? Int {
            keyString = String(eID)
        }

        let paAssign: Conf_speakers = Utilities.sharedInstance.getOrCreateObjectOfEntityName("Conf_speakers", key: "id", identifier: keyString, localContext: privateContext) as! Conf_speakers

        if let eeid = paAssignDict["id"]! as? Int {
            paAssign.id = String(eeid)
        }

        if let attendee_id = paAssignDict["id1"]! as? Int {
            paAssign.attendee_id = String(attendee_id)
        }

        if let agenda_id = paAssignDict["id2"]! as? Int {
            paAssign.agenda_id = String(agenda_id)
        }

        if let updated_at = paAssignDict["id3"]! as? String {
            paAssign.updated_at = updated_at
        }                       
    }
}

let error: NSErrorPointer = nil
do {
    try privateContext.save()                    
} catch let error1 as NSError {
    error.memory = error1
} catch {
    fatalError()
}

dispatch_async(dispatch_get_main_queue(), {
    appDelegate.managedObjectContext.performBlock { () -> Void in
        //var fds:Bool
        do {
            try
            print("Result MSG: \(appDelegate.managedObjectContext.save())")
            // fds = true
        } catch _ {
            //fds = false
        }
    }
})

Answer 1

 let appDel : AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context : NSManagedObjectContext = appDel.managedObjectContext

    let request = NSFetchRequest(entityName: "TableName")
    request.returnsObjectsAsFaults = false
    do {
        var results :NSArray

        try  results = context.executeFetchRequest(request)
        if results.count == 0
        {

        }
        else{

            let managedObject = results[0]
            managedObject.setValue(text, forKey: "TableEntity")
            //save data into table
            try context.save()


        }
    }
    catch{}