ios - 如何在 Swift 中从 Core Data 中删除多个不同的数据？

Question

我有包含五个对象的核心数据。它由四个 String 和一个 NSData (UIImage) 组成。我将它们保存在核心数据中。然后加载 UIViewController ，我想从核心数据中删除它们，但我得到了不同的错误。我尝试了不同的方法，但它对我没有帮助。如何删除这些数据？

var name: String!
var text: String!
var image: UIImage!
var url: String!
var data: String!

    func deleteAll() {
    var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
    var managedObjectContext: NSManagedObjectContext = appDel.managedObjectContext!
    var coreDataName: NSManagedObject = (name as AnyObject?) as! NSManagedObject
    var coreDataImage: NSManagedObject = (image as AnyObject?) as! NSManagedObject
    var coreDataText: NSManagedObject = (text as AnyObject?) as! NSManagedObject
    var coreDataData: NSManagedObject = (data as AnyObject?) as! NSManagedObject
    var coreDataURL: NSManagedObject = (url as AnyObject?) as! NSManagedObject

    managedObjectContext.deleteObject(coreDataName)
    managedObjectContext.deleteObject(coreDataImage)
    managedObjectContext.deleteObject(coreDataText)
    managedObjectContext.deleteObject(coreDataData)
    managedObjectContext.deleteObject(coreDataURL)
    managedObjectContext.save(nil)

    buttonDelete.enabled = false
    buttonShare.enabled = false
}

}

我的核心数据文件

import Foundation
import CoreData

@objc(News)

    class News: NSManagedObject {

        @NSManaged var dateNewsCoreDataString: String
        @NSManaged var imageNewsCoreData: NSData // NSData
        @NSManaged var nameNewsCoreData: String
        @NSManaged var textNewsCoreData: String
        @NSManaged var urlNewsCoreData: String 

    }

Answer 1

我更改了代码，它对我有用。

 var detailObject: AnyObject? // It's data from FavoriteTableViewController

    func deleteAll() {
        var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
        var managedObjectContext: NSManagedObjectContext = appDel.managedObjectContext!

        var dataDelete = detailObject as! NSManagedObject

        managedObjectContext.deleteObject(dataDelete)
        managedObjectContext.save(nil)

        managedObjectContext.save(nil)
        buttonDelete.enabled = false
        buttonShare.enabled = false
    }