创建nsmanagedobject而不保存[@Example]

这在IOS7、IOS8上进行了测试 .

创建tmp NSManagedContext :确保您的 NSManagedObject 当您的上下文将被解除分配时,不会为零。创建一个临时 NSManagedContext 在您的应用程序代理中。

在文件AppDelegate.swift中

import UIKit
import CoreData

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    private(set) var tmpContext : NSManagedObjectContext = NSManagedObjectContext()

    ....

}

创建NSManagedObject :请致电 customfile.swift tmp和主上下文。主上下文将用于在 被管理对象 .

    // CONTEXT
    let tmpContext     = (UIApplication.sharedApplication().delegate as AppDelegate).tmpContext
    let managedContext = (UIApplication.sharedApplication().delegate as AppDelegate).managedObjectContext!

    // ENTITY
    let entity         = NSEntityDescription.entityForName("MY_ENTITY_NAME", inManagedObjectContext: managedContext)
    let obj            = NSManagedObject(entity: entity!, insertIntoManagedObjectContext: tmpContext)

保存NSManagedObject :不幸的是,您无法通过传递主上下文来保存对象。为了避免,您需要复制 被管理对象

var error : NSError?

// CREATE YOUR NSManagedObject
    let managedContext     = (UIApplication.sharedApplication().delegate as AppDelegate).managedObjectContext!
    let entity             = NSEntityDescription.entityForName("MY_ENTITY_NAME", inManagedObjectContext: managedContext)
    let newObj             = NSManagedObject(entity: entity!, insertIntoManagedObjectContext: managedContext)


// COLLECT ALL VALUE SET OF YOUR OBJ            
    let keysObj            = (obj.entity.attributesByName as NSDictionary).allKeys
    let dictObj            = track.dictionaryWithValuesForKeys(keysObj)


 newObj.setValuesForKeysWithDictionary(dictObj)

 // SAVE ALL

 managedContext.processPendingChanges()
 managedContext.insertObject(newObj)
 managedContext.save(&error) // dont forget to check