Ios 从CoreData获取返回任何对象

我从coreData中获取实体数据，它返回任何对象，我在NSDictionary和NSArray中尝试了很多转换，但它不能转换任何类型

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)

报价实体不包含任何字段。请帮忙。我们将不胜感激

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)

---

`}

context.executeFetchRequest（）

返回

[AnyObject]

，而不是

AnyObject

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)

您需要执行以下操作：

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)

if let results = context.executeFetchRequest(fetchRequest2) as? [MyObjectType] {
      for object in results {
        //do thing
    }
  }

---

根据其签名，executeFetchRequest始终返回

任意对象的数组。AnyObject，因为返回值可以是
NSManagedObject
或
Dictionary
，具体取决于获取请求

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)

默认返回值是非可选的
[NSManagedObject]

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)

let result2 = try context.executeFetchRequest(fetchRequest2) as! [NSManagedObject]

该类型的强制展开是安全的。在这种情况下，不需要可选绑定

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)

如果您使用的是
NSManagedObject
的子类，您甚至可以将返回值转换为该类型。
您能解释一下[MyObjectType]是什么实体类型吗？我知道它返回NSManagedObject，但我能将NSManagedObject转换为nsdictionary或nsarray吗？我需要进一步解释它返回
[NSManagedObject]
。不要使用
NSDictionary
或
NSArray
，使用Swift原生类型
Dictionary
和
数组
<代码>[NSManagedObject]

是一个数组。[NSManagedObject]是一个字典数组。可以像使用任何其他数组一样使用它。

    var dictData:NSDictionary?
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = appDelegate.managedObjectContext;
    // self.selectedArray = response.objectForKey("retailers") as! NSArray;
    let fetchRequest2 = NSFetchRequest()
    let entityDescription2 = NSEntityDescription.entityForName("Offers", inManagedObjectContext: context)
    fetchRequest2.entity  = entityDescription2

    //fetchRequest2.returnsObjectsAsFaults = false

    do {
        let result2 : NSDictionary = try context.executeFetchRequest(fetchRequest2) as! NSDictionary
                   print("Result:",result2)
        for result in (result2 as? NSDictionary)!{

            if let data : NSDictionary = result as? NSDictionary{

                print(data)
            }

                print("result: ",result)
                print("dictData:",dictData)